Swedish teenage climate activist Greta Thunberg delivered a short,.. but direct message before a U.S. Congressional hearing on Wednesday,... calling on lawmakers to listen to scientists. Take a look.<br /> <br />"I am submitting this report as my testimony, because I don't want you to listen to me. I want you to listen to the scientists. And I want you to unite behind the science. Then I want you to take real action. Thank you." <br /><br /> The 16-year-old has been in Washington since last week,... to join activists in building support for a global climate strike,... and press U.S. lawmakers to take action.<br />Thunberg also met with former U.S. President Barack Obama on Tuesday.<br />Obama described the teenager on Twitter as "already one of the planet's greatest advocates." <br />
