WASHINGTON (Reuters) -President Donald Trump ordered the U.S. to withdraw from the Paris climate agreement on Monday, once again placing the world's top historic emitter of greenhouse gases outside of the global pact aimed at pushing nations to tackle climate change. Here are some reactions to the announcement of the second U.S. withdrawal from the climate pact: SIMON STIELL, U.N. CLIMATE CHANGE EXECUTIVE SECRETARY "Embracing (the global clean energy boom) will mean massive profits, millions of manufacturing jobs and clean air. Ignoring it only sends all that vast wealth to competitor economies, while climate disasters like droughts, wildfires and superstorms...