Scientists say that the world is currently undergoing warming due to carbon and other greenhouse gas emissions from human activities, such as burning fossils, deforestation, and land use changes. (news.mongabay.com)
Basically, it is due to the ever - increasing levels of carbon dioxide and other greenhouse gas emissions humanity pumps into the atmosphere. (relevantmagazine.com)
Now, many markets are preparing for the introduction of carbon dioxide and other greenhouse gas emissions trading. (worldwatch.org)