Are human activities responsible for the warming climate?
Yes. Careful measurements have confirmed that greenhouse gas emissions are increasing and that human activities (for example, the burning of fossil fuels and changes in land use, such as cutting down forests) are the primary cause. Scientists have confirmed that the recent increase in atmospheric greenhouse gas concentrations is primarily due to human activity. Human activities have caused the atmospheric concentrations of carbon dioxide and methane to be higher today than at any point during the last 650,000 years. Scientists agree it is very likely that most of the global average warming since the mid-twentieth century is due to human-induced increases in greenhouse gases, rather than to natural causes.