This year offers a disturbing first: mass bleaching in a year of La Niña. The grim milestone points to the continued threat of climate change and greenhouse gas emissions.
As Britain went into its first Covid lockdown, a scientist asked for help transcribing rainfall records spanning three centuries. Thousands of people online answered the call.
An analysis found leaks of methane, a potent greenhouse gas, from oil and gas drilling in the Permian Basin were many times higher than government estimates.