Russia's opposition leader and President Vladimir Putin's ardent critic Alexei Navalny had spent his last few weeks in a penal colony above the Arctic Circle before he reportedly died due to blood clotting.

'From ho-ho-ho to I love you': Here's how Putin critic Alexei Navalny described his last days in Arctic prison

According to the state of climate report, last year was one of the warmest years on record with "all major greenhouse gases released into Earth’s atmosphere reaching new record high concentrations in 2019.

2019 was among warmest years on record, Arctic temperatures also increased: Report

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'From ho-ho-ho to I love you': Here's how Putin critic Alexei Navalny described his last days in Arctic prison

2019 was among warmest years on record, Arctic temperatures also increased: Report