Greatest technological challenges facing humanity | Science | guardian.co.uk
We only need to capture one part in 10,000 of the sunlight that falls on the Earth to meet 100% of our energy needs,” said Ray Kurzweil, a renowned futurologist and a member of the NAE expert group, in a presentation at the AAAS. “This will become feasible with nanoengineered solar panels and nano engineered fuel cells to store the energy in a highly decentralised manner.”
The article starts with this paragraph:
Reversing the effects of ageing, reprogramming genes to prevent diseases and producing clean energy are some of the biggest challenges for the next 50 years, according to a group of leading experts.
Clean energy and clean drinking water are certainly more important than reversing the effects of aging and preventing diseases. You can go here and vote for what you think is most important.