<p>Michelle Obama has backed Swedish teen climate crisis activist Greta Thunberg and urged her to "ignore the doubters" after she was mocked by US President Donald Trump.</p>.<p>"Don't let anyone dim your light," the former first lady tweeted to 16-year-old Thunberg.</p>.<p>"Like the girls I've met in Vietnam and all over the world, you have so much to offer us all," she said.</p>.<p>Without mentioning president Trump, Michelle added, "Ignore the doubters and know that millions of people are cheering you on."</p>.<p>Thunberg, who has inspired protesters worldwide to push for action in combating the climate crisis, was named Time magazine's Person of the Year this week.</p>.<p>Trump on Thursday tweeted that it was "so ridiculous" for Thunberg to be recognised as Person of the Year.</p>.<p>"Greta must work on her Anger Management problem, then go to a good old fashioned movie with a friend! Chill Greta, Chill!" Trump wrote.</p>.<p>Following Trump's tweet, Thunberg updated her Twitter bio to reflect Trump's comments.</p>.<p>Democratic presidential frontrunner Joe Biden, who served as Barack Obama's vice president, chastised Trump for his comments, writing on Twitter, "What kind of president bullies a teenager?"</p>.<p>At the ongoing UN climate summit in Madrid, Thunberg accused rich countries of "misleading" the world over their response to climate change.</p>
<p>Michelle Obama has backed Swedish teen climate crisis activist Greta Thunberg and urged her to "ignore the doubters" after she was mocked by US President Donald Trump.</p>.<p>"Don't let anyone dim your light," the former first lady tweeted to 16-year-old Thunberg.</p>.<p>"Like the girls I've met in Vietnam and all over the world, you have so much to offer us all," she said.</p>.<p>Without mentioning president Trump, Michelle added, "Ignore the doubters and know that millions of people are cheering you on."</p>.<p>Thunberg, who has inspired protesters worldwide to push for action in combating the climate crisis, was named Time magazine's Person of the Year this week.</p>.<p>Trump on Thursday tweeted that it was "so ridiculous" for Thunberg to be recognised as Person of the Year.</p>.<p>"Greta must work on her Anger Management problem, then go to a good old fashioned movie with a friend! Chill Greta, Chill!" Trump wrote.</p>.<p>Following Trump's tweet, Thunberg updated her Twitter bio to reflect Trump's comments.</p>.<p>Democratic presidential frontrunner Joe Biden, who served as Barack Obama's vice president, chastised Trump for his comments, writing on Twitter, "What kind of president bullies a teenager?"</p>.<p>At the ongoing UN climate summit in Madrid, Thunberg accused rich countries of "misleading" the world over their response to climate change.</p>