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Earth’s Gases With And Without Life<br />
Surface Flux (10 12 moles yr -1 )<br />
10000<br />
1000<br />
100<br />
10<br />
1<br />
0.1<br />
0.01<br />
Earth<br />
Without Life<br />
Hydrogen<br />
Methane<br />
Isoprene<br />
Dimethyl Sulphide<br />
Ammonia<br />
Nitrogen<br />
Nitrous Oxide<br />
Carbon Monoxide<br />
Carbon Dioxide<br />
Oxygen<br />
Tim Lenton, Centre for<br />
Ecology and Hydrology
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