Cities like Bangkok and Berlin could face flooding due to climate change. Bangkok faces rising sea levels and extreme weather. In Berlin, increasingly heavy rainfall is challenging drainage systems. The 'sponge city' idea could be the way forward.
The world is suffocating in plastic, but PET is an alternative to single-use plastic. Unisensor has developed sorting machines that can produce 100 percent pure PET flakes from recycled bottles. Could it help to beat the plastic problem?
Computers are a heat source whose potential has yet to be tapped. The more data they process, the hotter they run. A home desktop PC may only produce enough thermal energy to warm up a small office, but there are data centers that have lots of potential.