agriculture
arid
bud
climate
conservation
crack
deforestation
desert
destruction
disaster
drought
dry
earth
ecology
environment
famine
forestation
germinate
global
green
ground
grow
growth
heat
hope
hot
land
leaf
life
nature
new
nobody
outdoors
plant
preservation
root
sand
scarcity
seed
shortage
small
soil
sprout
struggle
sun
tree
warming
water
weather
young