| global warming |
2,740,000/mo |
$1.17 |
| solar energy |
1,500,000/mo |
$4.09 |
| energy |
55,600,000/mo |
$2.04 |
| wind energy |
823,000/mo |
$2.74 |
| windmills |
823,000/mo |
$1.64 |
| wind turbines |
1,830,000/mo |
$2.35 |
| renewable energy |
1,220,000/mo |
$5.32 |
| ecosystem |
1,500,000/mo |
$0.87 |
| climate |
55,600,000/mo |
$0.60 |
| natural resources |
1,220,000/mo |
$0.85 |
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| ecosystems |
1,000,000/mo |
$0.67 |
| effects of global warming |
246,000/mo |
$1.18 |
| carbon dioxide |
2,740,000/mo |
$1.77 |
| environmental |
11,100,000/mo |
$2.68 |
| climate change |
2,240,000/mo |
$1.15 |
| sustainable development |
550,000/mo |
$5.31 |
| energy conservation |
301,000/mo |
$4.22 |
| environmental issues |
450,000/mo |
$1.40 |
| breast cancer facts |
18,100/mo |
$1.92 |
| air pollution facts |
12,100/mo |
$0.78 |
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