 He has written and spoken publicly about the fact that, despite past scepticism, he believes the Earth's climate is warming in a way that is cause for concern, and that this can likely be attributed to human activity.In a January 2013 interview with the "Radio Times", Attenborough described humans as a "plague on the Earth", and criticised the act of sending food to famine-stricken countries while overlooking population control.In May 2015, United States President Barack Obama interviewed Attenborough at the White House in Washington D.C.