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Tariff wars will hinder trade in green technologies such as solar panels and electric vehicles, and hamper the fight against climate change, says Ana Toni, CEO of the UN's COP30 climate conference.

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Swathes of northern and central China sweltered this week under record May heat, state media said Tuesday, with temperatures rising well above 40 degrees Celsius (104 degrees Fahrenheit) in several major cities.

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Europe's largest "green" methanol plant opened in Denmark on Tuesday, boosting the continent's emissions reduction efforts -- with customers ranging from shipping giant Maersk to toymaker Lego and pharmaceutical firm Novo Nordisk.