Data by the numbers:
7 Billion +++ Human Population
3 Trillion Estimate number of trees
24 Billion Estimate number of livestock
100 Billion Estimate number of land mammals
1 Billion to 1 Trillion Estimate number of land reptiles
1 Billion to 1 Trillion Estimate number of land amphibians
22 trees needed to provide oxygen for one person
In 2006 72.39 Million metric tonnes of carbon dioxide which gave a 20% increse in the last two decades, bigger than the 7% growth of US and 5% growth in Russiaa
Links and additional readings:
http://reducing-suffering.org/how-many-wild-animals-are-there/
http://www.theguardian.com/environment/datablog/2009/sep/02/carbon-emissions-per-person-capita
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