Already get your tomatoes in season from the farmers’ market or — even better — grow your own organic produce? If you compost like a pro, sew your own reusable napkins from pre-loved fabric, and never, ever forget your organic cotton shopping tote, you might be feeling smugly self-satisfied about your eco-eating ways or (in true treehugger style) fully focused on how to shrink your food footprint even further.

After all, a whopping 20 percent of the fossil fuel used in the United States goes toward growing, moving, processing, packaging, selling and storing food, according to Food & Water Watch. And that’s even before we’ve prepared and cooked our food — or dealt with any food scraps, leftovers or packaging.

Luckily, even diehard 100-mile-dieters can pick up some new easy and effective eco-ideas in this list of 24 green eating tips. Make them part of your daily routine to save fossil fuels — and a few bucks! — without completely revamping your already-pretty-green lifestyle.

INSPIRED EATS

1) Help yourself to heirlooms. Make your favorite recipes new again by cooking them with heirloom ingredients. Start small by scoping out the luscious heirloom varietals at your local farmers’ market, then plan ahead to pre-order your heritage turkey for Thanksgiving, and shun the Broad Breasted White turkey stocked in 99.9 percent of supermarkets. Your adventurous eating will help preserve biodiversity and keep regional specialties around for future generations.

2) Skip the syrup. Despite the Corn Refiners’ greenwashing ads, high fructose corn syrup is packed with empty calories — and was recently found to be laced with mercury. Everything from Hershey’s chocolate syrup to ketchup to Nutri-Grain bars to canned coconut milk can be made with this ubiquitous syrup, so scrutinize ingredient lists carefully before you buy.

3) Sweeten smarter. Conventional sugar is often produced with unfair labor — and sometimes processed with bone char, to the chagrin of vegans everywhere. An eco-smarter alternative is organic agave nectar, a low-glycemic index sweetener that prevents spikes in your blood sugar and is 1.25 times sweeter than sugar to boot. Or try organic yacon syrup, another low-calorie, low-glycemic sweetener. If only sugar will satisfy your sweet tooth, spring for the organic, fair trade brand; the blow to your wallet might convince you to cultivate a taste for something new next time.

4) Green your windowsill. Even the organic fresh herbs at your favorite co-op grocery store are often over-packaged — not to mention overpriced! Luckily, basil, dill, oregano, parsley, rosemary, sage, tarragon and thyme are all easy herbs to grow, so pick one or five you use often and start a mini indoor garden.

TECHY TOOLS

5) Kegulate. Ask for what’s on tap, and you’ll cut back on your brew’s packaging and transportation emissions. Drinking at home? Make your party a kegger too! Use egulator.com to figure out exactly how many kegs to get — calibrated for the number of partiers, their expected level of inebriation, and the inevitable spillage — and keep your shindig a zero-waste event. Serious beer-loving environmentalists should pick up a copy of Fermenting Revolution by Chris O’Brien to learn how to save the world by enjoying a good buzz.

6) Take the tuna test. If you weigh less than 200 lbs, eating just one can of albacore tuna a week can put you over the U.S. Food and Drug Administration’s recommended limit for mercury. Stay healthy by figuring out how much canned tuna you can safely eat at ewg.org/tunacalculator, or get mercury stats for all types of fish at gotmercury.org.

7) Develop a green thumb — by texting! Shop green on the go with Bon Appetit’s Eat Low Carbon Diet calculator. Text 69866 with the message “lcd” and the name of the food (i.e. “lcd chicken”), and you’ll get a text back with the food’s carbon rating. If you’re in the seafood section, use the Blue Ocean Institute FishPhone. Text 30644 with the message “fish” and the swimmer in question (i.e. “fish salmon”), and a return text will give you all the fishy details to help you decide on your dinner dish.

8) Makeover your leftovers. Yesterday’s dishes don’t have to be boring repeats. After all, a leftover hambone can be turned into everything from stock to bean soup to ham and greens. Visit leftoverchef.com to quickly find recipes that’ll get you more mileage out of your meals.