Strategies that can be implemented to reduce carbon emissions include
a. catalytic converters
b. compaction of soil
c. forest reduction
d. renewable energy

Stratiegies that can be implemented to reduce carbon emissions include renewable energy.

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The answer is c, i, iii, and iv. this is because farming and mining deal with harvesting raw materials, construction work falls under manufacturing, and piloting a plane is a service. ii is wrong because making bread is using  raw materials to produce goods, which would fall under the secondary sector, not primary.