Around the world, sea levels are rising, in part because the Earth is getting warmer, and the seas are expanding slightly, in part because glaciers are melting.
A number of gases in the atmosphere are causing global warming, or at least part of it. Some interest groups deny this to preserve their profit margins.
There is no absolute proof that burning fossil fuels causes global warming, but it makes sense, and there is absolutely no proof that it is not the culprit.
The greenhouse effect involves many gases, but water vapour and carbon dioxide are major ones which retain heat, and so assist global warming.
Small temperature changes in the oceans can have large effects on ocean life forms, because many life forms are operating close to some limit or another.
Coral bleaching is caused when water temperatures rise, and the coral animals are provoked to eject their symbiotic algae, which can also kill the corals.
Coral bleaching is not fully understood, but scientists think it may be caused by pollution, eutrophication, global warming , or maybe more than one of these.
The Earth has experienced a series of Ice Ages, some appearing to be more severe than anything that humans have experienced, but all causing great disruption.
The earth is getting warmer: most people believe that the major cause is human effects, a few people say that it is just part of a natural upswing.
Various methods may be used to determine past climates, including looking at fossil evidence and the ratios of stable isotopes in different sediments.
Global warming not only raises the temperature: it can also change climate patterns such as rainfall and storms, and may even cause some places to get colder.
Except for a few glaciers on or near volcanoes, every glacier in the world is retreating, melting faster at the lower end than new ice is added at the top.
Global warming is believed to be responsible for the increase in disastrous floods and storms in the past decade, because weather patterns have changed.
Weather patterns are metastable, which means that if they flip to a new mode, they probably will not flip back again unless something major changes.
All of the world's ocean currents are linked and influence each other, and all of them are driven by regular seasonal changes in world-wide weather patterns.