Actually, leaders everywhere have failed catastrophically to prevent climate collapse. This is largely because leaders in virtually every major industrial nation are awash in fossil fuel money.
That's why, after 28 consecutive COP meetings—including the much-heralded Paris Agreement—CO2 emissions continue unabated, and we are racing towards complete climate collapse.
There is a way out. Noncooperation and disobedience. The same strategies that enabled followers of Gandhi to force the British Empire to free India, and followers of Dr. Martin Luther King to desegregate the American south.