22
apocalypse
april
black
business
care
cataclysm
catastrophe
change
concept
conservation
contemplation
countdown
crumbling
dark
death
despair
destroy
disintegration
dust
earth
ecology
end
environment
faded
finish
flow
fragile
global
hourglass
life
limit
lose
nature
object
passing
planet
pollution
problem
process
resources
responsibility
sand
sandclock
sandglass
save
time
timer
waste
world