US groups honouring Paris climate pledges despite Trump

US states, cities and businesses signed up to 'America's pledge' to combat global warning have a combined economic power equal to the world's third-biggest economy

The US states, cities and businesses that have signed up to reduce greenhouse gas emissions despite president Donald Trump's threats to withdraw from the Paris agreement would, if put together, have the clout of the world's third biggest economy, after the US and China.

To date, 20 US states and more than 50 of its largest cities, along with more than 60 of the biggest businesses in the US, have committed to emissions reduction goals.