The man, who was running for the presidency, explained Trump's decision to get out of the climate treaty made him hurt.
Feelings of heart is believed not only felt by Gore alone, but the majority of Americans feel the same way.
Nevertheless, the decision has sparked another country's commitment to even more powerful reductions in greenhouse gas emissions.
Because Trump has changed the US move, Gore hopes that in the future his country will have a leader committed to halting global warming.