agriculture
animal
arid
bud
climate
conservation
crack
death
deforestation
desert
destruction
disaster
drought
dry
earth
ecology
environment
extinction
famine
fish
forestation
global
green
ground
grow
growth
heat
hope
hot
land
life
macro
nature
nobody
plant
preservation
responsibility
root
sand
scarcity
shortage
soil
sprout
struggle
sun
survival
warming
weather