Erik Verlinde's emergent gravity theory makes sense of the behavior of gravity without the need for the existence of a dark matter particle. Researchers from the Leiden Observatory have studied more than 33,000 galaxies to see if Verlinde’s theory checks out.

The Bloomberg New Energy Finance predicts that, while coal and gas costs will stay low, renewables will do better and will be the cheapest in many countries between now and 2040. Solar power is now around half the price of coal and gas, making it cheaper than wind energy, and ultimately the cheapest form of new electricity.

Scientists have discovered that "doping" graphene with nitrogen allows it to be an efficient electrocatalyst which can convert environmentally harmful CO2 into useful fuels. The technology is far from being ready for large scale application, yet the research is useful in the development of new catalysts that could provide a variety of useful applications in the future.

The famed British naturalist warns that our current rate of population growth is unsustainable and will ultimately have devastating consequences for the human race. He recommends several ways to combat this problem, emphasizing a need to give women political control of their bodies and investing in sex education worldwide.