Example sentences of "have have [adj] effect " in BNC.

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1 Oral contraceptives too have had long-term effects upon the health of users .
2 Fires set to control weeds on degraded pastures also spread , particularly to selectively logged areas as in Para , Brazil , as the gaps left have tracks connecting them and plenty of fuel : such have had devastating effects in Borneo during seasonal droughts ( see section 2.2.2 ) .
3 These varying conditions , all taking place over a comparatively short time , have had spectacular effects on the evolution of the mammals of South-East Asia .
4 But sometimes — usually — introduced species have had disastrous effects on the native flora and fauna , and sometimes on the human inhabitants .
5 The undeniable and striking formal qualities of composition in works by such masters as Hokusai and Hiroshige have had demonstrable effects on late-nineteenth-and twentieth-century European art .
6 None of the theses in the present study appear to have any paradigmatic effects on geology , but many have had accretionary effects , with evidence fitting into major syntheses , such as Craig 's ‘ Geology of Scotland ’ , ( 3rd ed , 1991 ) , and cited in that source .
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