The town of Rockport in Utah was fully submerged by 1957 after the US government approved a dam, but has now reappeared as a result of declining levels at Rockport reservoir.
Dunhuang in China 'disappears' as it is swallowed by gigantic wall of sand more than 300 feet high. Footage shows high rise buildings disappearing beneath the cloud of dust.
The UN Secretary-General António Guterres said that to limit global temperature rise to 1.5 degree Celsius, we must cut global emission by 45 percent by 2030 from 2010 levels.