Excellent question for discussion.
The problem I see with government action is the fact that ecological relationships among various species of plants and animals are so incredibly complex that it's very easy to do more harm than good. The classic examples would be introducing rabbits into Australia or kudzu into the American south.
On the other hand, if the situation leads to serious public health concerns or economic damage (the Mediterranean Fruit Fly crisis in California some years ago) it's often too late before you realize that you're in a crisis that will take a great deal of effort and resources to alleviate.
Human beings will, inevitably, make changes in the ecosystem. They may be relatively sudden and dramatic (the vast changes made in the New World with the arrival of Europeans and their plant and animal species) or they may be very slow and difficult to detect. (There has been a decline in the number of amphibians worldwide, and a rise in the number of deformed amphibians, for some time now. This sets off alarm bells in my head, like a canary in a coal mine.)Amphibian Declines and Deformities
What should be done? Proceed with extreme
caution. Listen to reputable scientific researchers, with as wide a variety of political viewpoints as possible, to get as many of the real facts as you can. Test your proposed solutions to the crisis on a small scale, with controlled conditions, to determine what unexpected effects might occur. Hope for good luck.