Shaun Donovan was sworn in as the 40th Director of the Office of Management and Budget on July 28, 2014. Donovan has committed his life to public service focused on good government and smart investment, while also building his leadership skills in the private, non-profit, and academic sectors.
A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect.The primary greenhouse gases in Earth's atmosphere are water vapor, carbon dioxide, methane, nitrous oxide, and ozone.Without greenhouse gases, the average temperature of Earth's surface would be about 15 Â°C (27 Â°F) colder than the present average of 14 Â°C (57 Â°F).he primary greenhouse gases in Earth's atmosphere are water vapor, carbon dioxide, methane, nitrous oxide, and ozone. Without greenhouse gases, the average temperature of Earth's surface would be about 15 Â°C (27 Â°F) colder than the present average of 14 Â°C (57 Â°F).
So this  natural greenhouse effect is very useful.    The gases that keep the earth warm are called greenhouse  gases. The most important gas, causing about 75% of the  natural greenhouse effect, is water vapor.The next most important  is carbon dioxide.o this  natural greenhouse effect is very useful.    The gases that keep the earth warm are called greenhouse  gases. The most important gas, causing about 75% of the  natural greenhouse effect, is water vapor.