Meditators are shown to have thickening in parts of the brain structure that deal with attention, memory and sensory functions. This was found to be more noticeable in older, more practiced meditators than in younger adults which is interesting because this structure usually tends to get thinner as we age.
I see a lot of individual action when it comes to environmental questions really as a form of politics as a way of communicating with political leaders, much in the same way that acts of civil disobedience during the civil rights' movement were really acts of political communication, trying to get laws changed rather than based on the thought that the individual action would really change the practices of segregation.