Originally Posted by transmitterdan
Global warming occurs because energy from the sun arrives at various frequencies or wavelengths (same thing). The Earth intercepts and converts that energy to heat and warms. Any mass warmer than another body will radiate energy away at frequencies that are much lower than most of the energy from the sun. CO2 acts as a filter at lower frequencies and attenuates some of this radiation. Other gases are also frequency selective filters. Gaseous water is a really good filter as is CH4 and CO2. Each gas has a different frequency that it can effectively filter. The amount of filtering is a function of the concentration (PPM) and other factors. So not all the energy is radiated away until the planet reaches a kind of thermal equilibrium. In that way it is kind of like the car getting hot. Other gases reflect the energy we receive from the sun before it reaches lower altitudes.
Itís a hugely complex set of factors which GW people admit. But they talk with great certainty about something no one truly comprehends. And propose upending society as the ďsolutionĒ. Thatís where most people get worried.
On your description you are pretty close. A couple of suggestions. The energy from the sun comes at the frequency based on the temperature of the sun. So 5780k which yields a wavelength of about 4 ums. The earth radiates back to space at its temperature which is 280k or 10-15 ums. CO2 and other gases donít act like filters ie blocking, they absorb the radiation. When they absorb it, they radiate it back just like earth did. That radiation is in all directions including back to earth which is why it warms the earth. Same as the glass in the greenhouse radiates back heat inside the greenhouse. Be happy to point you to websites that explain the physics far better than I can.
This part of the science has been known for more than 100 years. Nobody has dreamed it up to change the world order, you can get it from physics textbooks. What is more complicated are all the feedbacks both positive and negative to understand how much the earth will warm as CO2 amount is changed .
My point is to understand the basics which is not that complicated. Then you can argue about how much the temperature is going to change or not, what are reasonable solutions and how all of this will effect your sailing in the future