I agree with you that cutting back one's meat intake is an effective and manageable way to live more responsibly. That's why I work for Meatless Mondays, a campaign dedicated to encouraging Americans to stop eating meat on Mondays. If everyone stopped eating meat just for one day per week, meat intake would go down 15%. Not only would that reduce greenhouse gas emissions significantly, but cutting out meat once a week significantly reduces one's risk of heart disease, cancer, diabetes, and stroke- the four leading causes of death in the US, all preventable.
One day a week without meat makes the effort manageable, but it's still effective, in both health and environmental sustainability. You should check out our website for great articles and meatless recipes, http://www.meatlessmonday.com. This week features a meatless party dishes theme, but be sure to check out the recipe archives too, they even have a quick sautees and on the go section, perfect for cooking when you're busy.