Why are locally grown foods more eco-friendly?

Local food proponents often claim that food grown close to home helps prevent global warming because it requires less fossil fuels to transport, generating fewer greenhouse gas emissions than conventionally produced food. ... Many people consider food produced within a 100-mile radius as local.

Explanation:

It's good for the environment. Local food doesn't have to travel as far to arrive on your plate, so it helps reduce greenhouse gas emissions and contributes to improving our carbon footprint. It benefits the local economy, including supporting local farmers and other producers.

where and what are the statements?