Answer:

It is not deniable that we human beings are midgets in front of the powerful giant--nature. And often when environment changes greatly, we can do nothing but just bear it. However, I disagree with the over-pessimistic point of view in the topic, and for my part, I also do believe that individuals absolutely are not the ones who cannot do anything when faced with environment problems. And I hold this point of view for the following reasons.
Firstly we have to admit that sometimes as human beings, our power is still too limited to solve the environmental problems. As we all know, environmental problems are not the phenomenon of single cause, which on the contrary consist of many comprehensive and complex factors. For example, some regional climatic change which has terribly influence people's life could probably involve many reasons such as the air pollution, local over-deforestation or other inappropriate human activities. When one day we realize that this disaster is their "masterpiece", the recovery of the local environment has become the mission that is beyond people's ability.
Secondly, although faced with most of the currently existing environmental problems, efforts of individuals could fade, we should realize that most of the environmental problems render as the accumulation of individual ignorance towards environment and as long as we as individuals all stop our environment-unfriendly actions can we form strong power to prevent the deterioration of the environment. As we can see today, many policies of environmental protection are advocated and the sense of protecting our environment is being imparted to individuals. For examples, in order to decelerate the declining of our water resource, various kinds of water saving methods are applied for household and industry. What's more, self-conscious individuals are pay more and more attention to the energy saving in order to reduce the usage of fossil fuels and prevent the trend of global warming. And lots of organizations of individuals are trying their best to spread the advocacy of environment protection. Therefore in front of the environment problems individuals are really capable of doing something.
Last but not least, with the roaring development of the scientific technology, many environmental problems which used to be complex are now within the ability of human beings. And since individual understand the cause of some environmental problems, those problems are no longer complex as they used to be for individuals. For instance, in the past, we have no idea that the ozone layer were becoming thinner and thinner, even until the hole appeared, we still felt that we could do nothing to stop it. Nowadays with the advancement of the science, we know what causes the problems and by advocating that Freon should no longer be used, we can stop this trend.
To sum up, although sometimes environmental problems are really too complex to solve, we can still try our every of effort to fight against them. And with the development of the science, we can deal with more and more environmental problems which used to be impossible mission for us.