Measuring Sustainability

The Happy Planet Index is a new measure of progress that focusses on what matters: sustainable well-being for all. It tells us how well nations are doing in terms of supporting their inhabitants to live good lives now, while ensuring that others can do the same in the future.

Curent CO2 level: http://www.350.org/

To preserve our planet, scientists tell us we must reduce the amount of CO₂ in the atmosphere from its current level of 392 parts per million ("ppm")to below 350 ppm.