How are greenhouse gases related to climate change?

Greenhouse gases from human activities are the most significant driver of observed climate change since the mid-20th century. ... by the ocean surface), but some will remain in the atmosphere for thousands of years, due in part to the very slow process by which carbon is transferred to ocean sediments. read more

Greenhouse gases from human activities are the most significant driver of observed climate change since the mid-20 th century. 1 The indicators in this chapter characterize emissions of the major greenhouse gases resulting from human activities, the concentrations of these gases in the atmosphere, and how emissions and concentrations have changed over time. read more