A Project of the National Energy Policy Institute 
Carbon dioxide concentrations
Based on measurements taken from air trapped in ice cores, carbon dioxide concentrations were fairly stable at around 280 parts per million (ppm) from 1000 AD to around 1800 AD. After that they began climbing, surpassing 340 ppm before 2000 AD.
Source: Sustainable Energy without the hot air
-
RECENT POSTS
- Top five countries in installed renewables capacity, 2010
- Wind capacity in China
- Annual installed renewables capacity growth, excluding hydropower, worldwide, 2001-2010
- Concentrating solar power plants
- Trend in renewables share of electric generating capacity worldwide, 2000-2010
- Increase in world biodiesel production, 2010
- Trend in worldwide renewable generating capacity, excluding hydropower, 2000-2010
- Increase in worldwide renewable electricity installations, 2000-2010
- Trend in worldwide renewable generating capacity, including hydropower, 2000-2010
- World electric generation share from renewables