Russia's invasion of Ukraine has prompted the biggest shake-up of European energy markets this century. This film explains how Europe became so dependent on cheap Russian gas, and explores the hard choices facing the EU as it tries to balance energy security and climate ambitions.
SHANGHAI — Not a single country managed to meet the World Health Organization’s air quality standard in 2021, a survey of pollution data in 6,475 cities showed on Tuesday, and smog even rebounded in some regions after a COVID-related dip.
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