World leaders to cut carbon emissions overall agreement is less than a month, the global commitment to sustainable energy sources was the first big challenge: the sharp drop in oil prices.

Driven by lower oil prices, americans are reluctant to use electric cars, basic but prefer high fuel consumption of trucks and suvs. However, the Obama administration still unswervingly implement the new standard, requirements to 2025, auto makers would improve vehicle fuel economy nearly doubled.

In China, the government officials are trying to ensure that the newly has dropped to below $30 a barrel of oil condition to the development of its energy-saving projects. At the beginning of this month, China's highest department in charge of economic planning has offered a new measures to take effect immediately, aimed at curbing the fuel consumption.

Climate agreement if you want to work, governments must resist the temptation of cheap fossil fuels, to encourage and require the use of zero emission energy policy. However, these policies may cost is extremely high, politically uncomfortable, especially when conventional fuels become increasingly expensive.

"It's going to be the litmus test of a national governments, to see whether they are serious about the outcome of the climate conference in Paris," the International Energy AGEncy (International Energy AGEncy) by the director, Mr. Birol, Fatih Birol said.

So far, as the world's two largest energy consumer, the United States and China has yet to show any sign of shaking. Although the distance how long haven't climate agreement signed in the past, but when the two countries to forward the supporters of the climate deal will remain optimistic attitude, believe that this trend is inevitable. And, though the energy market fluctuate recently, sustainable energy industry is still booming.

"Driven by Policy and the progress of science and technology, the use of a higher proportion of low carbon Energy momentum will continue," Columbia University Center for Global Energy Policy (Center on Global Energy Policy at Columbia University), the director of Jason Mr Madoff (Jason Bordoff) said. He was President Obama's senior aides. He also said that although the fuel cost is lower, but the "replace policy and science and technology, is to reduce the demand of fossil fuels has begun to take effect."

A few days before the U.S. department of energy predicts its renewable energy consumption this year will rise 9.5%. In the long run, the prospects were very bright, it is a new energy costs continue to drop, the second is in December last year, congress decided to extend the tax credit of wind and solar projects.

According to the department of energy's data, in 2017, is the size of the grid solar power alone will increase by 45%. The Obama administration officials revealed the ambition, determined by 2050 use wind power to meet the demand of the United States more than one-third of the power supply.

As the world's largest greenhouse gas emitter, the Chinese government issued a new regulation, requirements, no matter how much the international crude oil prices of domestic gasoline and diesel prices will remain at $40 a barrel of oil price levels. The move is to prevent gasoline and diesel prices plummeted The Chinese began to blind consumption of fossil fuels.

In addition, the vast majority of China's oil refining industry was dominated by state-owned enterprises, they are not allowed to keep the extra profits, the profit comes from low price to buy but still in accordance with the price of crude oil $40 a barrel of crude oil to gasoline and diesel sales. The Chinese government will be part of this extra profits into a special fund, for energy conservation and pollution control.

However, around the world, is not a bright future of zero emissions technology.

Nuclear power plant almost don't emit greenhouse gases. But in recent years, the United States shut down several nuclear power station, under construction are also few, in part because of competition from cheaper gas.

Low oil prices also harm the alternative fuel replace the oil in the field of transportation and industrial development, including once looks very promising advanced biofuels. Low oil prices also depressed the price of diesel oil, and in Africa and southeast Asia in the process of the impoverished rural areas of universal power, biodiesel is a renewable energy's main rival.

In addition, once the government support and a half? Degrees is abate, alternative fuel industry is likely to encounter.

In Spain, since the government began in 2009 by the economic downturn to reduce support for renewable energy, halt the development of this field. In the UK, analysts warned that as the government subsidies for renewable energy have been phased out, the wind and solar energy industry might collapse; Two international wind energy project developers recently cancelled in the UK. In the United States, when an important tax credits short expires in 2013, almost all of the installation of a new wind electric field stopped, the installed capacity fell 92%.

In the end, support climate agreement, low oil prices may cut both ways on the progress of renewable energy sources.

"This is a double-edged sword," the University of California, DavIS (University of California, DavIS), executive director of the energy and sustainable project, Amy Myers Jaffe, a (Amy Myers Jaffe) said. She points out that low oil prices reduced the investment in the field of drilling, which means that the well number and methane emissions of the greenhouse effect is very strong, and obviously it didn't slow down to the renewable energy transition ".

Jaffe said, however, at the same time, low oil prices also make driving more attractive, for larger vehicles.

"It had a hit on electric cars," she said. "You would consider to buy electric cars, because the price is too high, fill up the car is too painful."