The best replacement for depletion is depreciation.

The best alternatives to depletion are rated as following:

★★★★★	depreciation
★★★★	dehydration
★★★	percentage depletion
★★	global warming
★	climate change
★	shipment
★	amortization
★	mass extinction
★	enhancement mode
★	enhancement
	cost depletion
	greenhouse gases
	output method of depreciation
	iron deficiency

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Speaking about depletion, one probably shouldn't forget about forest productivity.

Other search terms related to depletion and their ratings are:

★★★★★	forest productivity
★	plankton productivity

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Google Trends

Scale is based on the average worldwide traffic of depletion in all years. Click on graph for more.

depletion

depreciation

dehydration