34. The ‘moral hazard’ of geoengineering is that it is perceived as a technological fallback, possibly reducing effort on mitigation. However, the opposite may also occur: when there is wider knowledge on geoengineering, and its limitations and uncertainties, increased policy effort might be directed at emission reductions. Other ethical considerations include the question of whether it is acceptable to remediate one pollutant by introducing another. (Section 6.3.1)