nitrogen cycle

noun 0.757

sulfur cycle

noun 0.714

water cycle

noun 0.700

cycle

noun 0.648

citric acid cycle

noun 0.647

carbon

noun 0.630

carbon sink

noun 0.622

tricarboxylic acid cycle

noun 0.618

cycling

noun 0.616

life cycle

noun 0.613

carbon dating

noun 0.606

carbon sequestration

noun 0.599

cyclicity

noun 0.595

carbon trading

noun 0.594

carbon cost

noun 0.592

carbon fixation

noun 0.586

carbon dioxide

noun 0.586

carbonate

noun 0.581

biogeochemistry

noun 0.579

carbon oxide

noun 0.579

carbon footprint

noun 0.576

inorganic carbon

noun 0.575

glyoxylate cycle

noun 0.570

radiocarbon

noun 0.569

carbon burning

noun 0.568

carbon credit

noun 0.560

cyclicality

noun 0.558

macrocycle

noun 0.555

carbon emissions trading

noun 0.554

subcycle

noun 0.552

carbon market

noun 0.549

menstrual cycle

noun 0.545

biogeochemical

noun 0.544

black carbon

noun 0.543

carbon group

noun 0.543

cyclo

noun 0.539

machine cycle

noun 0.535

carbon-14

noun 0.535

carbon offset

noun 0.532

climate science

noun 0.527

food chain

noun 0.527

biosphere

noun 0.520

climate

noun 0.520

carbonation

noun 0.520

carbon tax

noun 0.519

recycling

noun 0.518

carbonic acid

noun 0.517

radiocarbon dating

noun 0.516

cyclothem

noun 0.516

carbonic acid gas

noun 0.516

cyclen

noun 0.515

activated carbon

noun 0.514

climate catastrophe

noun 0.514

greenhouse gas

noun 0.508

photosynthesis

noun 0.506

carbon-carbon bond

noun 0.506

ecosystem

noun 0.505

bicycle

noun 0.505

biomass

noun 0.502

heterocycle

noun 0.502

carbon arc

noun 0.501