Intelligence measures an agent’s ability to achieve goals in a wide range of environments...

Human intelligence is general in that it allows us to achieve goals in a wide range of environments. We can solve new problems of survival, competition, and fun in a wide range of environments

Too many uses of "wide range of environments."

Humans have invented languages...explored the planet...evolved new political and economic systems...

The origin of language is contentious and the range of opinions include some that have it occurring almost as naturally as a frog's hop. Better to leave it out.

Exploration is even less impressive. Rats are arguably more curious and have explored more places.

Political and economic systems, particularly non-failed ones, weren't planned and aren't even very well understood.

approaches are being attempted

"Tried" is much more common as a verb that steps away from the path metaphor. Other common verbs here, like "taken," fit it. "Attempted" just seems jarring to me.

Some other animals also have a slower but more general intelligence than Deep Blue and Watson.

Speed is only one very important difference between narrow AIs and weak NGIs, quality of the best solution found is another.

"Some other animals also have more general intelligence than Deep Blue and Watson, though their solutions to problems are much further from optimal and they reach them more slowly than specialist narrow AIs."

Instead, humans are nearly the dumbest possible creature capable of developing a technological civilization.

"We aren't able to integrate animals somewhat less intelligent than us, such as our chimpanzee relatives, into technological civilization. Considering the enormous room there is for improvement on human intelligence, an interesting perspective is to think of ourselves as among the dumbest possible creatures capable of developing a technological civilization."

Or take that line out.

But our intelligence is still running on a mess of evolved mammalian modules built of meat.

"Our intelligence is still running on a mess of evolved mammalian modules built of meat, not evolved simply to maximize intelligence but to use few resources and solve problems found in the early evolutionary environment. Most (?) of the brain modules we use for general intelligence didn't originally evolve to specialize at it, and are instead optimized for other tasks."

But Chalmers (2010) points out that their arguments are irrelevant:

A bit strong. "Some contend that...But Chalmers (2010) argues that their objections are irrelevant:" That's logically weaker, but maybe more manipulative in a dark arts sense, if it's not legitimate to frame the thesis "AGI is possible" as one to be assumed unless a compelling objection is made.

communicate much slower

"more slowly"

and thereby know everything about its own operation and how to improve itself.

The problem here is that it isn't grammatically clear that "everything" does not also apply to "how to improve itself."

Limited sensory data

Add bats.

Mention somewhere: http://en.wikipedia.org/wiki/Moravec%27s_paradox