7,550 feet up in the alps. it s also the climate change equivalent of taking lemons and making lemonade. that melting glacier is putting water into this lake from which they re creating renewable energy. to see it up close, you have to go a mile under the mountain. so, these are glaciers and then we re here, underneath the lake. that s right. reporter: our tour of one of switzerland s many hydropower plants. okay, go in. here. reporter: look at this. ends in the heart of the operation, the massive turbine room. how much of switzerland s energy comes from power stations like this? 60%. reporter: from water. reporter: water. water, much of which comes from glaciers melted by our warming climate. it s too late to save many of these majestic oceans of ice, but not too late to save our planet.