Swedish environmental campaigner Greta Thunberg on Saturday asked US voters to vote for Joe Biden, saying the outcome of the US presidential election was crucial for fighting climate change. Thunberg has had many a run-ins with the US president Donald Trump, who has on numerous occasions played down climate change. Biden on the other hand has reached out to Thunberg and hailed her commitment to the fight against climate change. Last month, the respected magazine Scientific American also urged readers to vote for Biden on November 3, the first time in almost 200 years that it has taken a political stance.