pollution of jets against turbine aircraft

With all the problem of the modern planes according to ecology (CO2,
white vapour trails, etc ...) I would like to ask a question :
-- does turbines and normal airscrew planes less pulluting aircraft
than pure jets one ??
-- does this aircraft use less petrol for a journey ( knowing that
they are 200 km/h slower than jets) ? If ies... how much less ?

tHanks for somebody "whoknows" to answer