What Astroturf Looks Like

Earlier today, thousands of protesters turned out in Copenhagen to demonstrate in favor of an economy-wrecking climate deal. This is how they looked:
Note the identical, professionally printed, color-coordinated yellow and black signs. This is what Astroturf–fake grass roots–looks like. The signs use the same colors as the International ANSWER signs that are ubiquitous at far-left rallies here in the U.S., but carry no identifier. It would be interesting to know who paid for the signs, and whether the same organization that bought the signs also paid for the demonstrators.