rome italy france germany say thursday regret u.s. president donald trump decision withdraw paris climate accord dismiss suggestion global pact could revise deem momentum generate paris december 2015 irreversible firmly believe paris agreement renegotiate since vital instrument planet societies economies leaders three countries say rare joint statement italian prime minister paolo gentiloni german chancellor angela merkel french president emmanuel macron urge ally speed efforts combat climate change say would help develop countries adapt three leaders try convince trump last week group seven summit stay pact honor u.s. commitments undertake previous administration speech white house trump say u.s. would look renegotiate agreement condemn call draconian financial economic burden impose deal unusual french-italian-german statement release barely hour trump announce decision underscore disappointment eurozone three large economies resolve plow ahead without washington support convince implementation paris agreement offer substantial economic opportunities prosperity growth countries global scale three leaders say therefore reaffirm strong commitment swiftly implement paris agreement include climate finance goals encourage partner speed action combat climate change speech trump complain paris accord require wealthy nations help develop countries build renewable energy source france italy german indicate ready help absence u.s. fund step efforts support develop countries particular poor vulnerable achieve mitigation adaptation goals three leaders say france italy germany defend paris accord say renegotiate