The best replacement for mitigation is adaptation.

The best alternatives to mitigation are rated as following:
★★★★★  adaptation
★★★  contingency
★★  remediation
★★  litigation
★  preparedness
★  prevention
★  adaptation climate change
★  avoidance
★  contested hearing
★  loan modification
★  restoration
  non structural mitigation
  contingency planning
  remission
  climate change adaptation

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Speaking about mitigation, one probably shouldn't forget about radon.

Other search terms related to mitigation and their ratings are:
★★★★★ radon
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mitigation
adaptation
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