A new study has worrying conclusions about changes to a vital aspect of the global climate system.
Why it matters: The apparent weakening of the Atlantic Meridional Overturning Circulation (AMOC) — largely because of melting ice — is a reminder that climate change could bring about nasty surprises in the future.
Nations' formal emissions-cutting pledges are collectively way too weak to put the world on track to meet the Paris climate deal's temperature-limiting target, a United Nations tally shows.
Driving the news: This morning the UN released an analysis of the most recent nationally determined contributions (NDCs) — that is, countries' medium-term emissions targets submitted under the 2015 pact.
