The earth is flat, the world was created 4000 years ago, and global warming is happening or is not man made..

then again..

Globally, observed CO2 emissions, temperature and sea levels are rising faster than expected. The warming has been fastest over land, and greatest in the higher latitudes of the northern hemisphere. Global ocean temperature rose by 0.10 ºC between 1961 and 2003, to a depth of 700 metres.

In Australia, there has been a 0.9 ºC warming since 1950. We have already observed changes to our climate that are more rapid than anything the earth has experienced for at least 1800 years. "Consensus as strong as the one that has developed around this topic is rare in science."
Donald Kennedy, former Editor-In-Chief, Science.

Results of this climate change include:

retreat of glaciers and sea-ice
a decline of 10-15 per cent of the Arctic sea ice extent and a 40 per cent decrease in its average thickness
snow depth at the start of October has declined 40 per cent in the last 40 years in the Australian Alps
an average sea level rise of 20 mm per decade over the last 50 years
changes in mating and migration times of birds
pole-ward and altitudinal shifts of plants and animals (especially in the Alpine zone)
an increase in coral bleaching due to increased water temperature.

Source? Australia's Commonwealth Scientific and Industrial Research Organisation