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.
The global rates of photosynthesis and cellular respiration influence the amount of carbon dioxide in the atmosphere. In the summer, the high rate of photosynthesis uses up much of the carbon dioxide in the atmosphere, and the amount of atmospheric carbon dioxide decreases.