ball
blow
blowing
boy
breathe
breathing
cause
change
child
children
conservation
conservationist
crisis
deflated
earth
ecology
endangered
environment
environmentalist
fragile
future
generation
geography
global
globe
green
heal
help
inflating
life
ozone
planet
prevent
prevention
protect
protection
resuscitate
resuscitating
revive
reviving
shrinking
support
tomorrow
world
youth