“cheerfully” (line 8) is synonymous with selfishly.

“pursue” (line 10) means the same as observation.

“widely” (line 17) is an exact synonym of tentatively.

“revenues” (line 20) means precisely the same thing as taxation.

“follow” (line 22) can be replaced in this particular context by stick to.

to use in an exploitative fashion lakes, rivers and coastal areas that are surrounded by luxuriant vegetation.

to offer a tourist something that looks suspiciously cheap.

the use of washing products or detergents that do not affect or damage rivers or forests.

to hide or obscure ecologically damaging activities deliberately in order to profit from a given situation.

to use a green pigment to gun paint elephants without harming them.

“whose” (line 14) can be replaced by which or that.

“safaris” (line 10) is in inverted commas to signal that there are no real safaris in Zimbabwe anymore for the local tourist authorities have banned them because they regard them as politically incorrect.

if “has become” (line 2) is replaced by became, no change whatsoever in meaning will take place in the sentence.

“for scuba-diving” (lines 6 and 7) can be replaced by in order to scuba dive.

“must” (line 19) expresses the notions of desirability or advisability.

Nevertheless.

As a matter of fact.

As a result.

In no time.

Sooner or later.

will certainly.

will similarly.

will probably.

will eventually.

will considerably.

limit.

budget.

reason.

aim.

"...threaten..." (line 18) and menace express contradictory ideas.

"...ongoing..." (line 21) means the same as occasional.

"...further..." (line 29) and spoil have similar meanings.

"...outcome..." (line 54) and results are synonyms.

"I could hardly remember what I had set out to accomplish when I first turned on my computer." (lines 7-9) – intended

"How can you stick to a plan when so many things threaten to derail it?" (lines 17-18) – abandon

"…to keep us focused on our priorities throughout the day." (line 22-23) – distant from

"What can you realistically carry out that will further your goals…?" (lines 28-29) – eliminate

"Shut off your computer and review your day." (lines 49-50) – start