. ♪ just under 200 years ago, french physicist and mathematician joseph fourier discovered the greenhouseect. when sunlight shines into a closed glass box, the box heats up because the energy cannot escape. no-one knew then that this also applied to our planet. nor did anyone know that that was because of the huge amounts of co2 emitted into the atmosphere by burning oil, gas and coal. things are different today of course. for decades, we've known why our climate is changing. but, doubts have been sown about it for just as long as well as about what needs to be done to stop it. >> memes. streams. shopping. communication. all the infoation in the world, ready, when you need it. the internet is a magical place. but there are also some weird corners. i'm talking about the dark underbelly. the ugly face of conspiracy theories and misinformation that shows itself in obscure forums and chat groups. especially under stories about renewables. we read the thousands of comments posted under our videos on wind and solar -- and collected those that smelled of misinformation. and slowlypatterns erged.