Crops produce the greatest
amount of waste, mainly from
plant parts not harvested as
food. why are most people less
concerned about crop waste
than other types of waste?

Because crop 'waste' is waste only because you can't sell it or eat it. 
Unlike other forms of waste, it's not toxic and it's not a pollutant.  The
'wasted' part of the crop is intentionally plowed back into the ground in
many cases.  It returns nutrients to the soil that were extracted to grow the
crop, and thus serves to partially replenish the soil for the next year's crop.

The investiture controversy began as a power struggle between pope gregory vii (1072–85) and henry iv, holy roman emperor (1056–1106).[2] a brief but significant struggle over investiture also occurred between henry i of england and pope paschal ii in the years 1103 to 1107, and the issue played a minor role in the struggles between church and state in france, as well.by undercutting the imperial power established by the salian emperors, the controversy led to nearly 50 years of civil war in germany, and the triumph of the great dukes and abbots. imperial power was finally re-established under the hohenstaufen dynasty. historian norman cantor:

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