Energy as a quick estimate of environmental impact

This works in most cases because:

• The majority of energy comes from fossil fuels. (see chart)
• The majority of greenhouse gas emissions are from energy production. (see chart)
• Since other energy sources(...)( i.e. nuclear, solar, wind, hydro, geothermal ) currently have very limited capacity, it could be said that any energy demand that exceeds that capacity will be met with fossil fuels.

Exceptions:

• When it comes to food:  Land usage is a much more accurate measure of environmental impact.
  • Reason:
    • Although energy is responsible for most of climate change, agriculture is responsible for almost all habitat loss(...)( which has additional environmental harms besides carbon emissions ).
    • Also, agriculture accounts for less than 2% of all energy use. ^{[pie chart link will be added here soon]}
  • Note: Agriculture has other impacts as well, such as from fertilizer (1.4% of the world's greenhouse gas emissions). 
    • One way to reduce all of agriculture's impacts at once, is to reduce food waste.