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Yes, Global Warming (or Anthropogenic Global Warming) is an issue. The issue isn’t that we’ll have some warmer days now and then in places that are usually colder.
If you think about what an average increase in the earth's temperature of +2 degrees Celsius over pre-industrial temperatures means, think about what an average is. It’s a mean temperature. What that means is that some places will be much hotter and some colder. Temperature (heat) is a measure of the average kinetic energy of matter.
Climate is the prevailing weather condition/s of a region/s. Weather can be seen as the movement of energy across the earth’s surface. As the energy (heat) goes up, the earth’s mechanisms (weather, air currents, water currents, …etc) become more active to balance out the energy. Simply put, all of these flows exist for the earth to balance out the energy across its surface. This is just a thermodynamic response to how the atmosphere, oceans, and land, interact.
What we’ll see then, is more energetic and frequent weather systems; More big storms more tornadoes. Again, thinking about energy. How does all that heat building up in the equatorial regions get dissipated? Well, the Gulf Stream is one way. Hurricanes are another. So, we may see more frequent more energetic hurricanes.
As global temperatures increases, we’ll also see the sea levels rise. This will come from the melting of ancient freshwater ice that flows into the ocean bringing the sea levels up to the ancient levels before the water was sequestered as accumulated snow/ice as the temperatures dropped. The biggest deposits of this ice are in the Greenland Ice Pack and in Antarctica.
Sea levels have risen and fallen over geologic time. The difference here is that the current temperature rise is caused by human industrial activity. During the sea rises of the past, the human race didn’t have to be concerned with the many millions of humans that are currently occupying the coastal plains that we see today.
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