Cool roofs are best at beating cities’ heat

Painting roofs white or covering them with a reflective coating would be more effective at cooling cities like London than vegetation-covered ‘green roofs,’ street-level vegetation or solar panels, finds a new study led by UCL researchers.

How to increase the rate of plastics recycling

A US nationwide bottle deposit program could increase recycling of PET plastic to 82 percent, with nearly two-thirds of all PET bottles being recycled into new bottles, at a net cost of just a penny a bottle when demand is robust. At the same time, pol…