各国的承诺是巴黎协议的核心。美国、欧盟（European Union）和巴西 等国要求2030年的二氧化碳排放低于2010年的水平。
 

其他国家的承诺反映了本国独特的国情和能力。中国和印度 的总排放量会上升，但2030年可低于预计原来按常态排放的数量，从而有助于大大降低全球排放。

很多人认为，2014年下半年美中两国联合声明提出的关键气候目标将推动全球实现巴黎协议的目标。

美国国务卿约翰∙克里（John Kerry）表示，“这是我们全体公民的巨大胜利。全世界以这个协议为中心携手共进，将推动我们为我们居住的星球找到一个新的解决途径，一条明智和负责的途径，一条可持续的途径。”

世界各国在成功地提交各自的承诺后，将每5年就本国的进展提出报告，争取通过各种途径实现预定的目标。某些国家将开发新能源 ，其他一些国家将注重恢复林地 。集思广益，众擎易举，降低温室气体排放的创新技术必然成为解决方案之一。

In December 2015, nearly 200 countries reached the most comprehensive global climate agreement ever. President Obama called it “ambitious, with every nation setting and committing to their own specific targets, even as we take into account differences among nations.”

Individual pledges are the core of the Paris agreement. Some pledges — those of  the United States, the European Union and Brazil among them — would reduce carbon dioxide emissions, with 2030 levels below those of 2010.

Other countries’ pledges reflect their unique circumstances and capabilities. While overallChinese and Indian emissions would increase, they would be lower than the anticipated “business as usual” levels projected for 2030, and thus contribute to significant global reductions.

Many credit the joint announcement of key climate goals by the U.S. and China in late 2014 with sparking global momentum toward the Paris agreement.

“This is a tremendous victory for all of our citizens,” said Secretary of State John Kerry. “The world has come together around an agreement that will empower us to chart a new path for our planet — a smart and responsible path, a sustainable path.”

As each country makes good on its pledges, all will report every five years on their progress. They’ll be trying different approaches: new energy sources for some nations, renewing forests for others. And with so many creative minds engaged, new and cool tech will certainly be part of the solution.