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the dramatic increases in crop production around the world from the second half of the twentieth century, as a result of the breeding of high-yield crops, and the wide-scale use of fertilizers and pesticides.
a diploid reproductive stage in the life cycle of many fungi and protists.
(also called the pith) the central part of the stem that consists of large, thin-walled...
the excessive growth of algae in eutrophic streams, rivers and dams.
responsible, low impact, usually small- scale travel to protected, unspoilt, natural areas and...