It's kind of a slang term referring to a problem that needs immediate attention.
Discrimination is a pressing issue within a business, the one who is discriminates is breaking the Anti-Discrimination Law.
This depends on what your views on science is... The most pressing health scientific issue is finding a cure for cancer that does not affect your blood cells. The most pressing earth science issue is preventing global warming. The most pressing physics issue is to find a theory of everything (unified field theory).
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Deforestation
The antislavery movement.
Presse isn't a word so there is no definition for this word!
finding the cure for cancer
To issue a second time., A second or repeated issue.
Macro
they are trying to produce less pollution
One of the most pressing environmental issues in Kenya is deforestation. Pollution is another issue that is increasingly becoming a problem.
Hamilton