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To reduce the negative impact if a volcanic eruptions you can do many things. You could use Hazard Mapping and Satellite Monitoring so you can tell exactly when the volcano will erupt. You could also use barrier walls to penetrate the lava flow and use diversionary lava channels. Precautions such as evacuation drills and emergency food and water supplies should be taken into hand too.
To reduce air resistance.
Yes, any material will reduce the impact of a paintball.
how can the breeding programme reduce the effects on human impact
You cannot reduce a tsunami. Just like other natural calamities like earthquake and volcanic eruptions, you cannot predict or reduce it. However, you can reduce its impact by taking protective measures outlined by responsible authorities.
Volcanoes cause Earth's climate to get colder because their airborne debris reduce insulation.
Many planes today are as efficient as they can be, but they are not "green" by any value. There is only one sensible way to reduce CO2 from air travel/freight and that is by reducing the amount of plane usage. Simple!! However. much of the world economy relies on airtravel, we saw that with the volcanic dust cloud - millions $ were lost.
anything will reduce the impact of a paintball
Extend the duration of the time of impact
Canals
explain how does smart growth try to reduce the impact of urban sprawl