form_title= Greenhouse Plastic form_header= Keep your greenhouse covered with greenhouse plastic. What is the square footage of your greenhouse?*= _ [50] What type of plants do you have?*= _ [50] Is the greenhouse solar powered?*= () Yes () No

This is true. The greenhouse effect on earth holds back heat escaping from the earth.

They make everything hotter

It's a little bit like a greenhouse, or a glasshouse, which keeps the heat in so that gardeners can grow exotic vegetables in cold climates.

Greenhouse gases have been working with the heat from the sun to keep the earth comfortably warm for millions of years. The gases absorb some of the heat from the warmed earth and keep it from escaping into space. When greenhouse gas levels increase, as they are from recent human activity, they retain more heat and the earth warms up.