EMMA FARGE and KATE ABNETT THE year 2020 was one of the three hottest years on record, marked by wildfires, droughts, floods and melting glaciers, a United Nations report said yesterday, prompting the U.N. Secretary-General to say the world stands "on the verge of the abyss". In a "double blow" to millions hit by the extreme climate events, lockdown restrictions linked to the global coronavirus pandemic also delayed crucial assistance in some regions, said the report by the World Meteorological Organization (WMO). The 'State of the Global Climate' report confirms its preliminary findings, including on land and ocean temperatures, and…