Paris accord

Paris accord: US and Syria alone as Nicaragua signs

The deal unites the world's nations in tackling climate change.

Nicaragua refused to sign it last year, arguing that it did not go far enough to tackle the problem.

In June President Donald Trump said the US would withdraw from the deal, but the rules of the agreement state that this cannot be done until 2020.

The president said it was part of his "solemn duty to protect America" and he would seek a new deal that would not disadvantage US businesses.

'Dodgy' greenhouse gas data threatens Paris accord

Air monitors in Switzerland have detected large quantities of one gas coming from a location in Italy.

However, the Italian submission to the UN records just a tiny amount of the substance being emitted.

Levels of some emissions from India and China are so uncertain that experts say their records are plus or minus 100%.

These flaws posed a bigger threat to the Paris climate agreement than US President Donald Trump's intention to withdraw, researchers told BBC Radio 4's Counting Carbon programme.

Bottom-up records