These are the most frequently used words in this book.
1985
1986
activities
africa
agencies
agricultural
agriculture
areas
between
billion
cent
change
chemicals
cities
conservation
control
costs
countries
developing
development
economic
economies
effects
efforts
energy
environment
environmental
even
food
forests
future
global
governments
groups
growing
growth
health
human
impact
increase
industrial
industry
international
land
large
level
local
major
management
materials
may
measures
million
must
national
nations
natural
need
new
now
nuclear
number
organizations
people
per
policies
pollution
population
problems
processes
production
products
programmes
provide
public
rates
report
require
research
resources
see
should
social
sources
species
states
support
sustainable
systems
technology
time
trade
un
urban
use
wastes
water
wced
world
years