Polar ice caps have been melting at an increasing rate since the 1990s due to the increasing level of greenhouse gases like carbon dioxide in the Earth's atmosphere. In 2005, 221 cubic kilometres (53 cubic miles) of the Greenland ice cap melted and fell into the sea, compared to 92 cubic kilometres (22 cubic miles) in 1996. One cubic kilometre is three times the amount of water used in a large city in a year. This water is raising sea levels, threatening coasts all over the world.
I didn't understand how a car (or wagon) starts its motion.