GEOLOGY

Detailed explanation-1: -Carbon dioxide (CO2) is the primary greenhouse gas emitted through human activities.

Detailed explanation-2: -Atmospheric levels of carbon dioxide-the most dangerous and prevalent greenhouse gas-are at the highest levels ever recorded. Greenhouse gas levels are so high primarily because humans have released them into the air by burning fossil fuels.

Detailed explanation-3: -CO2 accounts for about 76 percent of total greenhouse gas emissions. Methane, primarily from agriculture, contributes 16 percent of greenhouse gas emissions and nitrous oxide, mostly from industry and agriculture, contributes 6 percent to global emissions.

Detailed explanation-4: -The evidence is clear: the main cause of climate change is burning fossil fuels such as oil, gas, and coal. When burnt, fossil fuels release carbon dioxide into the air, causing the planet to heat up.

Detailed explanation-5: -CO2 sticks around. CO2 remains in the atmosphere longer than the other major heat-trapping gases emitted as a result of human activities. It takes about a decade for methane (CH4) emissions to leave the atmosphere (it converts into CO2) and about a century for nitrous oxide (N2O).