cause (n, v)
attack (v, n)
pollution (n)
factory (n)
fuel (n)
health (n)
result (n)
danger (n)
risk (n)
informtion (n)
traffic (n)
researcher (n)
disease (n)
connection (n)
society (n)
diet (n)
believe (v)
collect (v)
develop (v)
reduce (v)
reveal (v)
discuss (v)
encourage (v)
evidence (n)
claim (v)
protect (v)
fight (v)
important (adj)
scientific (adj)
increasingly (adv)
poorly (adv)
actually (adv)
properly (adv)
previously (adv)
probably (adv)
natural (adj)
decrease