John Kerry has been flying around the world trying to get some of the biggest polluters to step up their fight against climate change in time for a White House summit on April 22. If new goals are the measure of success, the meeting is shaping up to be a disappointment.

U.S. President Joe Biden’s climate envoy this week touched down in Shanghai — the most high profile stop on a tour that’s so far included India, the U.K., Bangladesh and the United Arab Emirates. Later he’ll travel to Seoul.

His mission is to re-establish America as a leader on global climate action after four years of backtracking under Donald Trump. That means setting an ambitious 2030 emissions reduction target and then cajoling others to strengthen their goals.