like potato farmer paul kimani. so what ishe solutioto the pollution? farmers are offered advice on sustainable practices by an organization headed by kamau mbogo. he also wants to know why the lake iconstantlyeing polluted. ul: the faers withinhis area are ung fertilirs. and that cnot be avoed because ofconomical atus. they have tomprove the rvest evy season th: theris a l of gap beeen the chnologyhat is avlable inhe big fms and whathe smallcale farrs are doing. and also the kind of advisory they get. because even when he has a problem with his potatoes, he just goes to the chemical store and he says, i have this problem. but they don't get to get an advice from the other methods that could be used that are more sustainable. reporter: kamau mbogo's organization promotes sustainable pest control. kamau: youse a good pest -- you can say a friendly pest, to ed on the bad pests thatre eding on yr crop. and this is a technology that is used in the cut ower. they have perfected it. reporter: that's nothing new for him.efore any sticides we avaible herethe fa