Maybe. While the immediate effects of DDT on fish, birds and mammals has largely subsided (for example the peregrine falcon is off the endangered list), there may be lingering effects to humans. A 1968 study found that Americans ingested 0.025mg of DDT per day, and there is current debate surrounding the possibility of this chemical to cause breast cancer. So it is possible, if it is true and there is a link between DDT and breast cancer, we are still seeing the effects today.
Yes. DDT is still used in many developing countries, and DDT is also very persistent because it remains stored in animal tissues, soil and water for a long time. See the link below for an article on the current day effects of DDT in our environment.
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