DR.Michio Kaku stated about 6 months ago on TV in the US that in 2012 the sun will unleash solar flares that could change the way we live and be damaging to the earth magnetic fields.
1st part: Thank you captain obvious. We have known for quite some time that the Sun was going to enter a time of great activity. Why? Because it is on a cycle. Sunspots, flares, ect, they are all part of the solar cycle. It would be a bad thing if they weren't happening, as it would be the sign of the beginning of the end of our sun. (Very slow death btw.) As it is, the active period is actually late by 2 years. It was supposed to start in 2008, but only really started in 2010.
Second part: Yes, it could disrupt satellite communication, as well as radio frequencies and cell phones, normal sunspot activity stuff. But to say that it will damage the magnetic field is just dumb. There might be a slight flux, but unless these flares are going to slow the Earth's rotation, the field will be just as strong as before.
The proof you seek is that all the planets are heating up not just ours as space probes have proven by images of eruptions,
Mercury: Dead planet. No volcanic activity.
Venus: Active Planet. High volcanic activity. Pancake Volcanoes
Earth: Active planet. Unique tectonic plates. Should not be able to support life at location with sun type. High magnetic field allows this. Volcanic activity.
Mars: Dead planet. Evidence of water on surface. Water found in southern pole underground. (Frozen.)
Asteroid belt: We got rocks yo!
Jupiter: Gas Giant. High storm activity. No solid mass, thus no volcanos
Saturn: Gas giant. Rings formed by pulverized moon. No solid mass.
Neptune: Gas giant. Has storms, but much less than Jupiter. Methane gives it its blue color.
Uranus: Same as Neptune.
Pluto: Made of ice. Downrated to Dwarf planet when other bodies that would have counted as planets were found past Pluto.
As for the moons. None have Volcanic activity as none are large enough to have a core. Titan is one of the exceptions, though it rains sulfuric acid there. Europa is ice, but has water underneath that might contain life.
TL;DR Your argument is invalid as most planets do not support volcanic activity, or even have a solid mass.
As for the other planets heating up. Nope, complete BS. Turns out, we can't really measure that accurately without going onto the surface itself. Plus, all of the planets take to long to get to and beam info back to get an accurate and timely reading about what they are doing. Mars takes years, and is the only planet that we can land stuff on. We can land stuff on moons though.
Now, on a more interesting note. We might have a long degree of fully lit day and night thanks to a supernova that astronomers believe will be reaching us in 2012. Day will be slightly brighter, and night will be like dusk.