On Oceans.

Warmer conditions are having an effect on our planet. The world's surface air temperature warmed 0.6 ℃ (1.1℉) on average during the last century. This may not sound like very much change, but it is. Below are some effects of climate change that are happening today.

Climate warming is causing areas to be more prone to drought.

More Water and fewer Glaciers: 

Rising sea level is a threat to coastal communities, wetlands, and coral reefs. During the 20th century, sea level rose about 15 cm (6 inches). In part, this was because of melting glaciers. The water from the melted ice is added to streams and rivers and eventually makes its way to the ocean. Over the past 100 years mountain glaciers, Arctic glaciers, and Greenland's ice have decreased dramatically in size. Sea level rise is also happening because the water warms, it takes up more space, it expands larger. Models predict that sea level may rise as much as 59 cm (23 inches) during the 21st Century, four times the amount of sea-level rise we have seen in the past century.

  

Each year, the amount of sea ice that covers the Arctic Oceans grows in the winter and melts at its edges in the summer. But lately, warmer temperatures have caused more ice to melt in the summer and less ice to grow in winter. The summer thickness of sea ice is circulation as the temperature and density of water changes. It is also speeding up warming in the Arctic, with less ice, less sunlight is reflected out to space and more is absorbed by the water and the land.

Changing Climate Means Changing Weather:

Climate warming is causing changes to weather in different regions of the world. In particular, it is causing more extreme weather events than we have seen in the past. these extreme weather events can have impacts on human health, limiting access to clean drinking water, food, and shelter and taxing people's ability to cope with heat, drought or flood.

• More rain and flooding: Warmer temperatures have led to more intense rainfall events in some areas. This can cause flooding - a risk to the environment and human health.
• More extreme drought: Warmer temperatures cause more evaporation, turning water into vapor in the air, and causing drought in some areas of the world. Places prone to drought are expected to become even drier over the next century. 
• Stronger Hurricanes: This may be true for tropical cyclones in other parts of the world. Scientists continue to study whether the climate is the cause.
• Heat Waves: It is likely that heatwaves have become more common in more areas of the world.

According to computer models, more global warming is in our future. If we continue to emit as many, or more, greenhouse gases, this will cause much more warming during the 21st century then we saw in the 20th century. During the 21st century, various computer models predict average temperature will climb 1.8°-4.0℃(3.2°-7.2℉).