We've just lived through the four warmest years on record, say scientists. And in Switzerland, temperature rises are twice the global mean. In fact, if nothing is done to tackle climate change, all the glaciers in the Alps could vanish by the end of the century. A move to make Switzerland carbon neutral by 2050 has just gathered enough signatures to go to a referendum, but who's coming up with solutions? All this year we have travelled to the far corners of the earth.This week we are focusing on the change our planet is going through - the threat to our future existence,but also what's being done to combat the threat. From Greenland last week, we have travelled to Switzerland.