What I have done to reduce my negative impact on the planet:
• Vegetarian since teens
• Drive fewer than 4K miles a year (true over the last 10 years, and as an average over my adulthood)
• Cycle more miles than I drive
• Compact florescents, rechargeable batteries
• Use 2000 kWh a year over the last four years (and my house has no other energy source)
• Don't have a lawn (don't use pesticides or fuel, promote eco-diversity)
• Spend less than $7K a year (consume and produce less garbage than the average American)
• Don't have children