The contaminants primarily derive from untreated agricultural drainage, municipal waste and industrial wastewater.
Tropical forests rely on moisture to survive and remaining areas of forest will be impacted by a drier climate.
Globally, around 14% of food produced is lost after harvesting but before it reaches shops and supermarkets.
Up to 15 threatened mammal, eight bird, four frog, one reptile and one fish species have recovered.
Success rates for large carnivore relocations have increased significantly since before 2007.
Heat-tolerant alga can help corals endure well into the second half of the current century.