However control measures, changing ecology and migration may have led to changes in the prevalence of schistosomiasis in different parts of Malawi.
Moreover, changing ecology, global warming and migration, may have led to changes in the prevalence and distribution of disease in different parts of the state.
"Changing [environmental] conditions on the island... [may] have led to changes in the chemical composition and nutritional value of the plant foods the sheep eat," he says, and that may have shrunk the sheep.
Shifts in opportunities have led to changes in what students study.
My efforts have led to changes and that makes it easy to make me the scapegoat".
Snowden's disclosures have led to changes in the way that terrorists communicate.
Stories of garbage and human waste have led to changes that have left base camp tidier than many trekking lodges.
In the past, a series of damning reports on housing, broadband access and transport have led to changes in policy.
Moreover, we can use the data to trace exactly which genetic changes have led to changes in an organism's appearance, or in what it does.
Gadde added that high-profile examples of Twitter users like Creasy being harassed have led to changes in the company's policies, response times to complaints and its product features.
In recent years, however, the negative effects of climate change have led to changes in rainfall patterns and intensity.
