In this week's sustainability news roundup, we find big progress on climate policy, big commitments from a UK retailer and competition in the big home-energy market.
Cities such as San Francisco, Stockholm and Adelaide, Australia, aim to reduce their waste to zero, but measuring and comparing their progress proves complicated. A new tool may help.
This week we find good green news from some of the world's biggest companies, ways to green cattle ranching, and one last, supremely bad Earth Day pitch.