Environduck
Enviroduck: Carbon Footprint Calculate Your Co2 Generation
Go green when you use carbon footprint calculator to figure CO2 and how to lower it.
Other
World Land Trust: Personal Carbon Balanced Calculators
You will find a series of calculators here for exploring what your carbon footprint on the Earth is, based on your use of air travel, your regular means of transportation, your household habits, and fixed carbon dioxide emissions for the...
National Geographic
National Geographic: Human Impacts on the Environment
Humans impact the physical environment in many ways: overpopulation, pollution, burning fossil fuels, and deforestation. Changes like these have triggered climate change, soil erosion, poor air quality, and undrinkable water. These...