And here's where most people (like myself) take issue. Our government (and others who believe every word they say, seebell says "HI!") want us to spend untold amounts of money (which will come out of taxpayer's wallets) toward something that is admittedly nothing more than a guessing game and educated guesses. It's much like the recent gluten fear mongering. Scientists (for some 10-15 years now) have preached like the gospel about all the bad things gluten does to the body. It has created a billion dollar market, caused people who have fell for the fear mongering to spend double on gluten free foods than what they normally would. Only to now find out that these same researchers are now saying what they'd been preaching for the last decade or so isn't true. That only gluten intolerant people are effected, which is about 1% of our society.
This is the problem with our science community. They are so arrogant and convinced as to how freakin' smart they are that (as in the gluten issue) they preach things as "fact" that in reality aren't. They're simply theories. When they preach things as "fact" it causes people to change their behavior, creates markets, causes government to want to spend billions and billions of dollars based on what is nothing more than theories. But I think the true answer is in the $$$$. As someone has alluded to, follow the $$$$ and that will lead you to the truth.