Gelatin vs Agar agar
Gelatin is hydrolysed collagen from pig skin and cattle hide. Agar, extracted from red seaweed, sets more firmly and does not melt in a warm room — useful for travel desserts and hot climates.
Per per set litre
Greenhouse gaseskg CO₂e / kg
Gelatin
9
Agar agar
1.5
Setting strengthrelative
Gelatin
1
Agar agar
1.6
Sets at room temperatureyes/no
Gelatin
0
Agar agar
1
Animals usedrelative
Gelatin
1
Agar agar
0
Source: Poore & Nemecek (2018), Science · Our World in Data · USDA FoodData Central
Verdict
Agar sets firmer, holds at room temperature and needs no slaughterhouse.
Questions people ask
How much agar replaces gelatin?
About 1 teaspoon of agar powder per 250 ml of liquid, boiled for two minutes to activate.