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Sharp spike seen in air pollution levels in recent years

After 23 years of decreases in overall air pollution levels, a new report shows that the United States recorded the highest ever number of "very unhealthy" and "hazardous" air quality days between 2018 and 2020.

Colombia eyes 200 tonnes of galleon gold

Colombia took a step Thursday toward recovering a long-lost Spanish wreck and its fabled riches, but it may be a rough ride as Spain and native Bolivians have also staked claims on the booty.

US to reimpose limits on power plants' mercury emissions

The US government announced Monday it wants to revive a regulation limiting air emissions of mercury and other toxic substances from fossil fuel-fired power plants that had been undermined by the previous administration.

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