|
 | how have humans contributed to green house gases? | |
|
| we emit greenhouse gases by burning fossil fuels. | |
|
|
|
|
|
|
| also carbon dioxide is the singlwe most problem that humans cause in the effects of global warming. | |
|
| another cause is methane from animals. | |
|
|
|
|
|
|
| methane is the second most cause of green house gases emitted. | |
|
| methane is produced by cattle, dairy cows, buffalo, goats, sheep, camels, pigs, and horses. | |
|
|
|
|
|
