aerial

algae

aquatic

bacteria

bloom

blue

chemicals

conservation

contaminated

contamination

covered

cyanobacteria

danger

dangerous

disaster

drone

dump

ecological

ecology

ecosystem

environment

environmental

flora

green

industrial

industry

infected

lake

landscape

natural

nature

organic

outdoors

plankton

plant

polluted

pollution

problem

river

scum

sewage

slime

summer

surface

swamp

toxic

vegetation

waste

water

zone