Letters: Lead by actions, not talk

Re: “How the Paris climate deal pullout could hurt the U.S.” [Opinion, June 4]: The United States did not “abdicate … its world leadership” on climate change when President Trump signed an order to begin pulling out of the Paris agreement entered into by President Obama last year. Real leaders lead by actions, not talk.
An MIT study concluded in 2015 that if every nation performs its unenforceable promises under the Paris agreement, the effect on climate by 2100 wo