"Believe", you don't believe in science. Science relates to facts, and while the facts can be interpreted in different ways, the increase in Earth's temperature and its relation to certain gases is undeniable.
Of course, companies and politicians who want to keep the high-spending way of life instead of looking for less-toxic, cheaper, renewable energy sources (aka Oil companies, car companies, and their friends -only some of the most powerful lobbies in the world-) want to consider it a lie and something "you believe in", as if it were a religion or something, to have an excuse to ignore it and keep making money instead of investing on plans to improve their methods.
I'd add this image, also from Wikipedia:
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https://en.wikipedia.org/wiki/Medieval_Warm_Period
In other words, there was a "little warm period", then there was a "little ice age" and now there is another warm period that, in a single century, has got over anything the "little warm period" had. In other words, yes, we are coming off an ice age, that's true, but that the increase in temperature is unnaturally large and quick is also obvious.
Whether or not it's caused by our species, it doesn't change the fact that we're irresponsibly using limited resources such as oil and coal and are poisoning ourselves with the pollutants they put into the air. We get enough of such pollutants from the dominant meat sources for our species (large farm animals like pigs and cows).
The whole greenhouse gas effect pertains to the decreasing rates of heat escaping, not preventing heat from escaping altogether, just so you're aware.
Uh, no one ever said that heat isn't escaping. If heat wasn't escaping, night wouldn't be colder than day. Obviously heat is escaping, it's just the rate that heat is escaping is less than that of heat building up. That's what has always been said - all that article is doing is exploiting a well-known fact, leaving out important details, and incorrectly explaining events.
Also, here is a website that lists all the evidence and causes of climate change. Wait..that's weird. It seems to be NASA's government website.
Edit: Here is their "Causes" page where they clearly say that heat is still escaping, just more slowly. And that source is from 2007.
Just focusing some points.
Most of what I wanted to say has been said already in these posts. The only thing I'd add to them is that the Earth itself releases infrared radiation to space all the time. The high concentration of greenhouse gases doesn't mean that there is like a 5 kilometers thick bubble made of concrete around the planet that lets nothing get out. Heat still escapes to space. But it's escaping at a slower rate.
So no, it's not a hoax. It's pretty damn real. Get over it.