It is the new snapchat update. The yellow heart means- you're each others #1 best friends. Yes I'd like to know too. I think it means your best friends but not sure!!
Carbon dioxide in the atmosphere: 1  allows sunlight and heat into the atmosphere, but doesn't let it get out, causing the Earth to heat up. 2  along with water vapor, methane, and a few other gases keep the Earth from becoming a deep freeze on the side away from the Sun.arbon dioxide in the atmosphere: 1  allows sunlight and heat into the atmosphere, but doesn't let it get out, causing the Earth to heat up. 2  along with water vapor, methane, and a few other gases keep the Earth from becoming a deep freeze on the side away from the Sun.
Practically all the carbon in the Earthâs atmosphere exists in the form of carbon dioxide (CO 2) and methane (CH 4). The picture below shows the global carbon budget for 2010. This is a way of tabulating the amount of carbon (in billions of tons) that is released by carbon sources and absorbed by carbon sinks.