any environmental impact or degradation so in this case, we are building dams that are changing the hydrologyg impacts to fish and biodiversity of the river. so currently, these low water levels in the drought, what kind of impact are they having on the ecosystem? the fisheries and the people who live around the delta? this is one more stressor and it's a major stressor so we are changing the basin in major ways, there is fishing pressure, there is climate change going on, the dams are being built so we add on drought and it's hard to give exact numbers but we know that this is a stressor and this is one more stressor and this is very important because as you mentioned, there are 60 million people in the basin and a lot of them depend on fish to eat as their everyday food source and it certainly is a protein source so food security really matters as well. what is the solution right now, professor? what should be the short—term and long—term plan of the governments involved to be able to resolve this crisis? one of the best things we can do is if we care about fisheries and food security, we s

. >> but looking at the soil, looking at the hydrology, how we do stormwater, runoff, all of that is part of the plan, and certainly integrated pest management once we actually have the parks and gardens in operations is so very important. but the soil is particularly important at this time because we are building, and if you don't have the right soil, the right soil mix, the composition of soil, you're never going to get plants to really thrive. so i think we need to work with the landscape architect -- i see somebody is here from c.m.g. to look into what are the specifications for that soil? you know, we have native soil on yerba buena island. treasure island is disturbed soil because it was fill that was brought in, but certainly, the experts on your team -- there should be an expert on your team who's looking at what type of soil is being brought in. sometimes, it's construction debris, and they just bring any old soil in, and that's not going to work for the 300 acres of parks and open space that we're going to have. let's make sure that we get the right type of material that's n