Wouldn't it make more sense for the company to just plant trees or do environmental work or something? I imagine researching and eventually switching to an entirely different material will be on the order of (at least) a half a billion dollars for a company with six billion bucks a year in revenue, probably more.
[edit] I agree with the general sentiment of the comments below, and trust me I'm as concerned about climate change as the rest, but LEGO has so far invested about $200 million into something with an environmental cost of around $5-10 million - and they haven't even gotten close with the solutions they've found so far. $200 million spent in the right places can do a massive amount of good, far more IMHO than a more sustainable LEGO.
To put things in perspective: each LEGO brick is 47 grams of co2. One transatlantic flight is about 3 tons of co2. So one transatlantic flight is equivalent to nearly 60,000 LEGO pieces.
I agree that changes have to come from everywhere to effectively fight global warming, but I think that there's a limit. At what point do you just not bother? There's got to be a cutoff. And couldn't 200 million bucks be used so much more effectively against climate change?