Earth can probably only carry one billion humans. As long as human populations continue growing, the battle [to save the planet] will be lost.
地球大概只能给养十亿人，如果人口继续增长，(拯救地球的)战斗就会失败。
2
Lost forest cover heats the planet, because trees absorb CO2 while they're alive - and when they're burned or cut down, the greenhouse gas is released back into the atmosphere.
Lost forest cover heats the planet, because trees absorb CO2 while they're alive -and when they're burned or cut down, the greenhouse gas is released back into the atmosphere.