Syria and Nicaragua were the only two nations outside the 195-nation pact when it was agreed in 2015. Nicaragua signed up last month.
The urban heat island effect makes cities several degrees warmer than nearby rural areas, adds to air and water pollution and makes workers less productive.
The vault on the Svalbard archipelago seeks to safeguard the world’s food supplies from cataclysms such as nuclear war or disease in natural permafrost.
The study indicates that an ice-free Arctic Ocean, often feared to be just years away, could be delayed if nature swings back to a cooler mode.
World temperatures hit a record high for the third year in a row in 2016, creeping closer to a ceiling set by the Paris climate change deal.
In 2011, Breivik killed eight people with a home-made bomb outside the prime minister’s office in Oslo and then gunned down 69 others on an island nearby.
Global surface temperatures in 2016 averaged 14.8 °C, or 1.3 °C higher than estimated before the Industrial Revolution ushered in wide use of fossil fuels, the EU’s Copernicus Climate Change Service said.
Experts say it would be wrong for climate change deniers to interpret the expected 2017 dip as a sign of an end to the long-term trend of global warming.
Nicaragua was the only nation to reject the agreement last December arguing for far more drastic action to limit rising temperatures.
The index is showing a steeper plunge in wildlife populations than two years ago, when the WWF estimated a 52% decline by 2010.
It was unclear if the cold waters could delay a melt of ice locked up on land in Antarctica, the biggest worry about the continent that could sharply raise global sea levels.
Details left vague by the 31-page Paris Agreement include how countries will report and monitor their domestic pledges to curb greenhouse gas emissions and adapt to changes such as more floods, storms, desertification and rising seas.
The agreement sets targets for shifting the world to green energies by 2100 but is vague, for instance, about how governments will report and monitor their national plans to curb greenhouse gas emissions.