As climate change sets in, some of the wonders of the world may not wait around for you to experience them. Mighty glaciers will shrivel and melt, ancient cities will sink beneath the waves, and rising sea temperatures may devastate the Great Barrier Reef. David Salt makes a whirlwind tour of the top 10 places you need to visit - before they disappear.

In this travel issue of Cosmos, we highlight the best places Earth has to offer. From the long-hidden treasures of Angkor, Cambodia, to a kingdom ruled by birds in the remote South Pacific, our writers transport you to the wonders of our world.

Many of the problems we face today are not insurmountable: it's amazing how just a few changes can have a dramatic impact. Take cars: if all of us drove petrol-electric hybrids we'd be 70 per cent of the way to reaching the targets we need to by 2050 in order to stabilise the planet. Not bad.

In this issue of Cosmos we look at some of the background and solutions to our growing environmental challenges. We look at green cars, technology mimicking nature, Earth's evil twin, the coming plagues and a beautiful photo gallery of animals under pressure.

Our modern obsession with celebrities may be the result of evolution, scientists say. We delve deep into human psychology to answer the question: Why do we care about the lives of the rich and famous? You may dismiss celebrity gossip as harmless fun, but it may be not only be deeply ingrained in the human psyche - it may even be good for you, as Erica Harrison discovers.