What does each axis of this graph represent?

What types of fuel are being compared, and what are their original sources?

Locate each of the following on the graph: U.S. corn ethanol, Brazilian (BR) sugarcane ethanol, Brazilian soy diesel, Malaysian (MY) palm oil diesel, and gasoline. Note that the first four are the most economically important biofuel sources.
Rank all five in terms of their total environmental impact, from highest to lowest. Which has the highest environmental impact and which has the lowest? Assuming that all were equally abundant, which would be the most environmentally friendly choice, based on total environmental impact?

What kinds of things does the measure “total environmental impact” likely include? (Hint: Remember to look at Infographic 25.3.)

Why is the environmental impact for Brazilian soy diesel high?

Assuming that the scientists who evaluated these data are correct, what type of fuel contributes the least amount of greenhouse gases and has the lowest total environmental impact? Why do you think its impact is low relative to other fuel sources?

According to the graph, which biofuel would make the most environmental sense to use in North America, given our current standard of living and the resources we have access to?