A diet which includes meat is responsible for annual greenhouse gas emissions equivalent to driving a mid-sized car for 3000 miles.
A vegetarian diet will generate 50% less emissions (1500 miles).
Going vegan (no animal products at all, no dairy, no fish, no milk) cuts the emissions released by around 87% (to the equivalent of driving just 391 miles).
Organic meat is nice and all, but an organic meat-based diet only reduces your emissions by around 8%.
You can browse some vegetarian recipes here, and some main courses that are vegan here.
From the two lists, the lentil-based recipes jump out: Red Lentil Balls and Spiced Lentils with Cucumber Yogurt.
Also read: 10 Surprising Reasons To Eat Less Meat