This is a very broad statement. The world is so concerned with who is right and who is wrong regardless of the issue at hand. I have come to use whats called the precautionary principle to make the case for change...
"The precautionary principle is a moral and political principle which states that if an action or policy might cause severe or irreversible harm to the public, in the absence of a scientific consensus that harm would not ensue, the burden of proof falls on those who would advocate taking the action."
C.J. Tickner
For example, not having 100% scientific assurance that greenhouse gas emissions are causing global warming is not an excuse to do nothing about it. If we do something about it and it turns out that wasn't the problem we lose money. If we don't do anything, and that is the problem, we could be in big trouble.
DEEP...THINK ABOUT IT.