More than 170 countries - including Australia and Italy - have signed the Paris agreement on climate change at the United Nations headquarters in New York. It's signaled their commitment to put the landmark deal - to curb global temperature rise - into practice. Climatologist Luca Mercalli reports.
More than 170 countries - including Australia and Italy - have signed the Paris agreement on climate change at the United Nations headquarters in New York. It's signaled their commitment to put the landmark deal - to curb global temperature rise - into practice. Climatologist Luca Mercalli reports.
