The E-Xplainer looks at environmental terms and phrases, and breaks them down into chunks of information you can actually do something with. Got something you’d like explained? ! This week, Ecological Footprints.

The first gas-guzzling modern car came to the market in the early 1900s, when the production line for automobile creation became established. Today there are over 590 million passenger cars worldwide. A century later, and we now have access to a range of other vehicles that run on alternatives to fossil fuels.
Topics: anchovies, biking, clean diesel, commuters, emissions, Japan, man-made waves, sewage, slums, surfers, sustainable fishing
Topics: Arctic ice, bike safety, eco-eBay, GTA, oilsands, paintless car
Topics: China, Climate Change, Ghost Ships, Hockey stick, Hurricane Gustav, New Orleans, nitrogen, sustainable economy
Topics: Alberta, California, climate change, Japan, London, panda bear, tropical storm, turtle, urban sprawl
Topics: biofuels, Darryl Hannah, Ecuador, green roofs, ladfill mining, New York, plastic, tofu waste, urban farm