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1st blank: Electricity generation
2nd blank: transportation
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The largest source of anthropogenic greenhouse gases in the United States of America is electricity generation, followed by transportation.

Greenhouse gases can be defined as the gases that trap heat within the Earth's atmosphere. Some examples of greenhouse gases that are present within the Earth's atmosphere include:

  • Nitrous oxide
  • Carbon dioxide
  • Methane
  • Water vapor

An anthropogenic greenhouse gases refers to the emissions of greenhouse gases that are primarily caused by humans through the burning of fossil fuels such as petroleum, coal, and natural gas, especially for the generation of energy.

In United States of America, the largest source of anthropogenic greenhouse gases in a descending order are:

1. Electricity generation

2. Transportation

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