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On the first day of the hottest June ever recorded, a letter from a group of concerned citizens arrived at the United Nations Framework Convention on Climate Change. Rising greenhouse gas emissions, the letter warned, would warm the planet to dangerous levels unless more action was taken to curb climate change. The letter鈥檚 authors called on world leaders to implement a global price on carbon to 鈥渉elp stimulate investments in the right low carbon technologies and the right resources at the right pace.鈥�

The message itself was not so extraordinary. For years, economists and environmentalists have made the case for using price signals to efficiently and effectively tilt global energy toward cleaner sources. But this letter didn鈥檛 come from a think tank or an environmental group. Instead, the signatories of the June 1, 2015 dispatch were chief executives of some of the world鈥檚 most carbon-intensive companies 鈥� oil supermajors like BP, Eni, and Statoil 鈥� companies that profit enormously from the very fuels carbon pricing aims to curtail.

鈥淧ricing carbon obviously adds a cost to our production and our products,鈥� , 鈥渂ut carbon pricing policy frameworks will contribute to provide our businesses and their many stakeholders with a clear roadmap for future investment, a level playing field for all energy sources across geographies and a clear role in securing a more sustainable future.鈥�

Some dismissed Big Oil鈥檚 call for a popular climate policy as a public-relations ploy. Others noted that only European firms signed on, representing just one slice of a sprawling international oil and gas industry. But if taken in earnest, the letter from six oil supermajors reflects a widening acceptance of climate change as a challenge humanity should 鈥� and can 鈥� tackle. Even more significantly, the letter offers up .

In Brussels and in Beijing, at top universities, in board rooms of the world鈥檚 largest companies, in city and state capitals throughout the US and beyond, and across the liberal-conservative spectrum, momentum is building behind the wonky financial tools that make carbon emissions more expensive. Taxes and markets have been used to solve global environmental problems of the past. Now there鈥檚 hope they can address today鈥檚 climate challenge. It鈥檚 a viewpoint espoused by nonprofits like the Sierra Club. But it also gets the backing of energy multinationals like Royal Dutch Shell.

鈥淭he transition to a cleaner future will require government action and the right incentives,鈥� Rachel Kyte, the World Bank鈥檚 vice president and special envoy for climate change, wrote in an email to the Monitor. 鈥淎t the center should be strong public policy that puts a price on carbon pollution.鈥�

The idea is simple. We consider carbon-heavy fuels like coal cheap because we usually don鈥檛 factor environmental costs into the final market price. Inflating that price 鈥� either through a tax on carbon emissions or carbon credits that emitters can buy and sell 鈥� sends a clear and strong signal in the universal language of money. Markets adapt to the added cost burden, discouraging emissions-heavy fuels and encouraging lower-carbon ones like natural gas, or zero-carbon sources like nuclear power and renewable energy. Unlike clean-energy quotas or other top-down policies, carbon pricing offers a certain level of predictability, flexibility and efficiency that makes it attractive to a wide range of diverse constituencies. Carbon taxes and emissions trading tell producers to reduce carbon emissions, but it allows each producer to determine for itself how to do so.

Putting the idea into practice, however, is another story. Exactly how much should carbon cost? Set the price too high and there鈥檚 a risk of public backlash against more expensive gasoline and other everyday goods. Set it too low and emitters have little incentive to change their behavior. Europe experienced the latter when it rolled out an emissions trading system in 2005. US efforts to implement a similar cap-and-trade system stalled in the Senate. Australia implemented a carbon tax in 2012, only to repeal it three years later amid shifting politics. 听

Setbacks aside, faith in carbon pricing as a climate-change solution is growing. Last month, China announced it would implement a nationwide emissions trading system (or cap and trade) by 2017. As the world鈥檚 most populous country and the world鈥檚 largest emitter, it would make for the world鈥檚 largest and most significant carbon market.

On a sub-national level, cities and states in the US and abroad are implementing their own taxes and trading systems to reduce emissions. The Obama Administration鈥檚 Clean Power Plan, finalized in August, promotes cap-and-trade as one method states can use to meet new emissions-reductions targets. In the private sector, major energy firms already factor in a theoretical carbon price in internal accounting. Other companies 鈥� voluntarily tax themselves for carbon use as a way to lower their climate impact and improve internal efficiencies.

鈥淢any governments are already putting a price on carbon as part of their climate protection strategies,鈥� German Chancellor Angela Merkel said in a statement this month as part of , a coalition of heads of State, city and state leaders backing carbon pricing. 鈥淲e should advance our effort along this path further so that we can actually reach our goal of maintaining the two degree upper limit.鈥�

Currently, about 40 national and over 20 sub-national jurisdictions have implemented or scheduled carbon-pricing systems, according to . That represents nearly a doubling of such systems since 2012. All together, global carbon taxes and trading systems are estimated to value just under $50 billion, according to the World Bank and Ecofys.

With just a couple months before major international climate talks in Paris, analysts believe market-based solutions will factor into how more countries, states, and cities across the globe reach future emissions-reductions goals. After all, these financial instruments helped phase out dangerous pollutants in the 1970s, 1980s, and 1990s. There鈥檚 hope they can do the same for today鈥檚 planet-warming gases, but the spread of these solutions have not kept pace with the scale of the problem. 听

鈥淭here has been a proliferation of carbon pricing schemes in recent years, but it only covers about 12 percent of global emissions and most of them with prices that are too low,鈥� Christine Lagarde, managing director of the International Monetary Fund, said during an event in Washington in September. 鈥淪o we鈥檝e only just started to scratch the surface of the problem.鈥�

Fixing a hole

Remember the ozone hole?

If not, it鈥檚 because scientists, economists, and policymakers largely solved what, in the 1980s, looked like a mounting environmental problem. Chemicals used in refrigeration, aerosols, and other everyday items were thinning out the planet鈥檚 stratospheric ozone layer, which blocks out dangerous ultraviolet radiation. Nations came together in response under the Montreal Protocol, deemed the 鈥渟ingle most successful international agreement鈥� by no less an expert than former UN General Secretary Kofi Annan.

Adopted in 1987, the protocol capped the use of chlorofluorocarbons (CFCs), halons, carbon tetrachloride, and other compounds responsible for chewing away at the ozone layer, and . Some countries, including the US, created their own domestic cap-and-trade systems, which helped to gradually end the use of ozone-depleting substances in the developed world. By 1998, the ozone layer stopped thinning over most of the world, and scientists believe that the layer should return to pre-1980 levels sometime between 2060 and 2075. Experts often point to the Montreal Protocol as a case study for how cap-and-trade systems can address environmental problems that transcend national borders. 鈥撎齮o eliminate lead from gasoline and to slash the sulfur-dioxide emissions responsible for acid rain.

Transposing past cap-and-trade success stories onto global climate change has proven difficult. Ozone depletion, leaded gasoline, and acid rain, and were perceived as much more immediate public threats than global warming, which many still view as a distant threat. Alternatives to lead-based gasoline and ozone-depleting substances were fairly readily available when countries came together to phase them out, and the technology needed to reduce sulfur dioxide emissions was relatively cheap.

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Meanwhile, alternatives to the carbon-based fuels responsible for the bulk of global greenhouse-gas emissions, are harder to come by. Solar, wind, and other carbon-free energy sources are rapidly becoming viable alternatives, but swapping out one energy system for another is a much taller order than swapping out one kind of refrigerant or gasoline for another. What鈥檚 more, the technology needed to capture carbon dioxide emissions from coal plants remains economically viable only in certain instances. 听听

鈥淭he Montreal Protocol has been successful largely due to the very specific nature of ozone depletion that allowed alternatives to be developed and deployed effectively,鈥� Ms. Kyte told the Monitor. 听鈥淎ddressing climate change, on the other hand, is an economy-wide challenge. It is not associated with a single point of pollution and cannot be solved only through isolated solutions or a technology switch.鈥�

These obstacles haven鈥檛 stopped major emitters from trying to use cap and trade to curb planet-warming emissions. In 2005, the European Union, the world鈥檚 third largest emitter, launched what remains the world鈥檚 largest cap-and-trade scheme. Then, the global economy collapsed. Demand for polluting energy fell and thus so too did prices for carbon credits. Prices hovered around $7 per metric ton in the EU鈥檚 Emissions Trading System (EU ETS) at the time, whereas the they would need to cost around $65 per ton to nudge utilities away from coal-fired plants. As a result, companies had little incentive to cut down on emissions. By 2013 the system was facing a crisis. When the EU attempted to reduce the number of permits by delaying the scheduled release of new ones, the initiative failed in the European Parliament.

, as environmental economist Robert Stavins and others have noted. Indeed, it may just be evidence of unrelated factors like slow economic demand or other energy policies working in concert with cap-and-trade to reduce emissions. 听The primary concern with the EU鈥檚 system was over its inflexibility. When market conditions changed dramatically, efforts to adapt to new realities fell short or failed completely. While the EU ETS has outgrown early growing pains, the EU still struggles to balance the system. Last month, the European environment ministers

Efforts to implement a similar system in the world鈥檚 No. 2 emitter never made it out of the US Senate. Early in his first term, President Obama made passing cap-and-trade a priority, but the Waxman-Markey legislation was abandoned in 2010, largely under the pressure of a limping economy and opposition from Republicans and energy-state Democrats. But where cap and trade failed nationally in the US, it has found more success at the state and regional level.

In 2009, ten states in the Northeastern US implemented a Regional Greenhouse Gas Initiative (RGGI) that capped carbon-dioxide emissions from electric power plants. In its first four years, the program (which now covers nine states) raised over , according to RGGI. Much of that money was reinvested in regional clean-energy and efficiency programs. RGGI estimates that over their lifetime, those programs will save 11.5 million megawatt-hours of electricity and avoid the release of approximately 10 million short tons of carbon emissions. That鈥檚 the equivalent of taking 1.9 million cars off the road. Meanwhile, participating households and businesses are expected to save more than $2.9 billion in lifetime energy bills. It鈥檚 an ideal outcome for a carbon pricing scheme: avoided emissions, more efficient energy, reinvestment in the region, and reduced energy bills.

Of course, RGGI alone isn鈥檛 cleaning up Northeastern US energy. The Great Recession of 2008 and a boom of cleaner-burning natural gas have also contributed significantly to decreased energy use and a shift toward lower-carbon. But RGGI鈥檚 quiet success has inspired other US states like California and Oregon to implement, or at least consider, a cap-and-trade scheme of their own.

Now, cap and trade faces its toughest challenge yet. China, the world鈥檚 largest carbon emitter and second-largest economy, announced last month it would implement its own emissions trading system by 2017, motivated by its smoggy skylines and a desire to be a clean-energy leader. It鈥檚 a daunting task. China faces regional corruption, pushback from state-owned energy companies, and the fundamental issue of transparent data collection. It turns out determining just how much energy China consumes 鈥� and how much carbon dioxide it emits 鈥� is easier said than done.

鈥淭he key to any successful cap-and-trade program is quantity certainty,鈥� says Joanna Lewis, associate professor of science, technology and international affairs at Georgetown University. 鈥淭his will most certainly not be easy to do in China, but the pilot programs have begun the arduous task of improving the statistical and accounting system so that carbon emissions can be measured and tracked overtime.鈥�

Those pilot programs 鈥� introduced in seven Chinese cities and regions in 2013 鈥� have established a basic framework to build upon when designing the national program. They have shown some signs of success, but a report last month by the World Resources Institute found that remain persistent problems. 听听

Scale remains perhaps the greatest challenge. It鈥檚 one thing to design a transparent, efficient market for a city of 11.51 million. It鈥檚 another task entirely to design one for a country of 1.4 billion. 听

A tale of two levies

When. Instead, it 听opted for a tax.

Launched in 2008, British Columbia鈥檚 carbon tax is lauded for its revenue-neutral design. A reduction in income taxes offsets a new levy on the carbon content of fuels. The result? 听while economic growth kept pace with the rest of Canada, according to Sustainable Prosperity, an Ottawa-based think tank. Income and corporate taxes, meanwhile, were slashed, and the program earned the praise of international financial institutions such as the World Bank and the Organization for Economic Cooperation and Development. 听By 2012, , meeting an interim goal on the path to cutting emissions 80 percent by mid-century.

There鈥檚 a reason many economists prefer the kind of carbon tax British Columbia adopted. Cap-and-trade systems tend to be complicated, bureaucratic, and vulnerable to exploitation. A tax is simple and elegant. When combined with a tax reduction elsewhere, the impact on the economy is a net neutral, or even positive. 听听

鈥淚t is the hardest-to-rig solution out there,鈥� says Mark Reynolds, executive director of Citizens鈥� Climate Lobby, an international grassroots environmental group. 鈥淗ow can you trust a lot of corrupt governments to do a complex system like cap-and-trade? Everyone knows how to tax.鈥�

Last month, the IMF鈥檚 Ms. Lagarde joined a growing chorus of support for a global carbon tax over other methods to cut back on emissions.

鈥淸W]e鈥檝e looked at the benefits of both systems and pretty much unanimously come to the conclusion that a carbon tax is more efficient, much easier to administer, and will not leave way for a lot of unnecessary friction or leakages in the system,鈥� Lagarde said last month at an event hosted by the French embassy in Washington.

The drawback of a carbon tax is that it is regressive. Poorer households spend a larger share of their income on basic necessities like heating and transportation fuels than higher-income households. A $15 per metric ton carbon tax would cost households in the lowest income bracket more than twice as much as households in the top 10 percentile, . Still, supporters argue that carbon-taxing schemes can be designed to offset the negative impact they could have on low-income populations.

鈥淸E]verything depends upon how it鈥檚 structured and where the money goes,鈥� says Tyson Slocum, director of the energy program at Public Citizen, a nonprofit, consumer-advocacy group. 鈥淵ou have to take into account where the revenue is being redirected.鈥�

Even in developing countries that face difficult financial hurdles to increasing taxes, advocates say increased revenue from a carbon tax can be used to alleviate other tax burdens. With some simple financial reshuffling, a carbon tax can be completely revenue neutral and can even spur growth.

Politics present another obstacle in the way of implementing a successful carbon tax. Any policy with the word 鈥渢ax鈥� in it has a way of scaring off voters and their elected representatives in government. 听 听

Consider Australia. After years of contentious debate, the Australian government, under Labor Prime Minister Julia Gillard, implemented a carbon tax in 2012. Three years later, it was gone. Pro-business Prime Minister Tony Abbott helped push for the tax鈥檚 repeal after being elected on a promise to 鈥渁x the tax.鈥� All told, between 2007 and 2014, the national debate around carbon taxing contributed to the political demise of three Australian Prime Ministers who supported the tax.

鈥淭he problem with the carbon tax has always been more political than economic,鈥� says William Cline, senior fellow at the Peterson Institute for International Economics. 鈥淚t鈥檚 fair to say that the broad consensus on this is that a tax is the right way to go, but there is a resistance to any notion of a tax.鈥�

Paris

If there were ever a moment for countries to harness the momentum behind carbon pricing, it would be in Paris this December.

Delegates from 195 countries will convene in the City of Light to finalize a global climate agreement that is years in the making. Virtually everyone involved agrees greenhouse-gas emissions must be dramatically slashed, but debate persists over how exactly to do it. The current strategy relies on a patchwork of voluntary commitments from individual countries, with little in the way of binding, shared actions.

For some, carbon pricing would add a much-needed centralized component to a largely decentralized agreement. 听 听

鈥淎 global carbon price 鈥� so far excluded from consideration in international negotiations 鈥� would be the ideal basis for a common commitment in our view,鈥� write David J. C. MacKay, a professor of engineering at the University of Cambridge, and colleagues, . 鈥淎 price is easy to agree [on] and handle, relatively fair, less vulnerable to gaming than global cap-and-trade systems, and consistent with climate policies already in place, such as fossil-fuel taxes and emissions cap-and-trade.鈥�

And yet, carbon pricing has been largely absent from draft agreements. Negotiators involved in the talks widely agree that countries would be reluctant to sign an agreement that includes a requirement to tax carbon. Countries are concerned about their sovereignty and the impact such a scheme could have on their national economies. What鈥檚 more, the economics of determining a single price for a commonly used good on a planet of 7 billion are staggering.

But even though the Paris agreement itself will not result in a global carbon price, experts believe a strong commitment to reduce emissions in Paris would accelerate the proliferation of such schemes around the globe. As individual countries seek ways to make good on their ambitious climate pledges, they may turn to the market-based systems that show promise in British Columbia, the northeastern US states, China, and elsewhere.

Even . Perhaps in response to the growing support, the latest version adds the following note to the preamble, in brackets to signify it is still up for debate:

鈥淸P]utting a price on carbon is an important approach for cost-effectiveness of the cuts in global greenhouse gas emissions.鈥�