No, not really.

Here's the thing. On earth, we have literally dozens, if not hundreds, of satelites monitoring the temperatures, weather patterns, sea currents, ice melting, and many other factors. There's also thermometers in pretty much every city everywhere.

In short, we have a lot of data from the past 100-200 years to show that our environment is changing. We can make correlations between many changes and the increase of greenhouse gases such as carbon dioxide, methane and others.

On other planets, we do not have the ability to measure things as frequently or accurately as we do here on earth. At best, we have a few rovers on mars, and rovers have visited Venus, Jupiter, Saturn, I think Mercury, and a few other planets. So we get one rover, for maybe a couple years, every ten years or so.

There's no good way to measure other planets.

Also, many other planets don't have atmospheres, or atmospheres made of different amounts of different gases, so the sun's rays react differently then they do on earth.

That being said, it is believed that an increase in solar flares contributes between 4-20% towards Global Warming. Here is an article from a reputable science site, Science Daily, that cites that figure.

http://www.sciencedaily.com/releases/2003/10/031002055621.htm

Using the low end, yeah, it's a drop in the bucket. Using the high end, the solar part of global warning could be substantial, but not a major contributing factor when compared with greenhouse gases.
Source(s):
http://www.sciencedaily.com/releases/2003/10/031002055621.htm

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