Climate change skeptic turned proponent

[Aractus]

You have to show that rate of antropogenic CO2 pumped into the atmosphere is equal to the rate of CO2 absorbed by the ocean. However, we know this is not the case since the CO2 concentration in the atmosphere has gone up by 40% according to your numbers.

Also, the ocean water store a lot of natural GHG. As the water warms up, it can holds less and less GHG, giving a positive feedback.

That explanation you just gave off the top of your head is incorrect. It's actually the deep-ocean activity that dictates the capacity for CO2 absorption by the oceans. Furthermore it's the deep-ocean currents which itself may be the true driving factor for climate change.

As the surface temperature increases, ice melts which reduces the amount of light reflected back into space. Hence, a positive feedback.

Actually again that's not entirely true. If temperatures had not increased at all in the 20th century and had stayed the same throughout that time there would still be some Arctic melting, and glaciers would still be melting also because the climate is unable to sustain them. Global warming in the 20th century has accelerated this, but it didn't start it.