Plant a Tree

It might sound like a bit of a cliche, but planting trees is by far one of the most important gifts we can give back to the planet and to ourselves. Global warming is caused by a buildup of greenhouse gases in our atmosphere (such as carbon dioxide and methane), which traps heat on the planet. But trees have the ability to suck up carbon dioxide, which is why the Amazon and other forests are so important. If every person on the planet plants one tree, that amounts to nearly 7 billion new carbon sponges. You can plant a tree in your own backyard, or join a group.