Scientist: There is a lot of concern that human behavior may be responsible for large-scale climate change. But this should be seen as more of an opportunity than a problem. If human behavior is responsible for climate change, then we can control future climate change to make it less extreme than previous climate shifts. The scientist's argument requires assuming which one of the following? ['At least some previous large-scale climate changes have been caused by human behavior.', 'Human beings can control the aspects of their behavior that have an impact on climate change.', 'It is easier to identify the human behaviors that cause climate change than it is to change those behaviors.', 'The same degree of climate change produces less damage if it is caused by human behavior than if it has a purely natural cause.']