Isn't there an urgency to act now?

It is interesting to me that climate change is now being viewed from a military perspective, and problems are expected within 20-30 years. It concerns me that this time frame is realistic. It highlights our need to do all we can right now at the individual level, knowing that we still can make a difference and avoid future conflict. We all must broaden our sense of urgency about the potential for catastrophic change that will come politically as well as environmentally due to our own actions. Isn’t it realistic to believe that each one of us can set an example to the world of a commitment (on any level and in any way possible) to the health of the environment?