What is in the Paris climate agreement?

Many polluting countries came together in Paris and agreed to limit carbon emissions. The Paris agreement was created to keep the planet from warming above preindustrial levels. The countries tried to adopt clean energy and eliminate fossil fuels and the most developed countries that support economically in other underdeveloped countries, but Donald Trump is withdrawing the US from the accord. Developing countries say they need financial and technological help to leapfrog fossil fuels and move straight to renewables. The national pledges by countries to cut emissions are voluntary.To make the reduction of CO2 waste there will be an average investment of 100 thousand million dollars anually. 

I think that Donald Trump has made a very big mistake when withdrawing from the Paris Agreement. Everyone would have to make an effort to reduce CO2 emissions.