A method of manufacturing a poly(ether-carbonate) polyol, comprising: a polymerization stage that includes polymerizing carbon dioxide and at least one alkylene oxide, with a starter, in the presence of a double metal cyanide polymerization catalyst and a catalyst promoter that is devoid of halide anions and cyanide, the catalyst promoter being separate from the double metal cyanide polymerization catalyst; wherein the catalyst promoter is selected from the group consisting of: magnesium alkyls; magnesium alkoxides; magnesium aryloxides; magnesium amides; magnesium acetylacetonate; magnesium t-butylacetylacetonate; scandium alkoxides; scandium aryloxides; scandium acetylacetonate; scandium t-butylacetylacetonate; yttrium alkoxides; yttrium aryloxides; yttrium amides; yttrium acetylacetonate; yttrium t-butylacetylacetonate; hafnium alkyls; hafnium alkoxides; hafnium aryloxides; hafnium amides; hafnium acetylacetonate; hafnium t-butylacetylacetonate; titanium alkyls; titanium aryloxides; titanium amides; titanium acetylacetonate; titanium t-butylacetylacetonate; zirconium alkyls; zirconium alkoxides; zirconium aryloxides; zirconium amides; zirconium acetylacetonate; zirconium t-butylacetylacetonate; vanadium alkoxides; vanadium oxo tris(alkoxides); vanadium aryloxides; vanadium tris(acetylacetonate); vanadium tris(t-butylacetylacetonate); vanadium oxo bis(acetylacetonate); zinc alkyls; alkyl zinc alkoxides; zinc alkoxides; zinc aryloxides; zinc amides; zinc acetylacetonate; zinc t-butylacetylacetonate; trialkyl aluminum compounds; aluminum alkoxides; aluminum aryloxides; aluminum amides; aluminum acetylacetonate; aluminum t-butylacetylacetonate; alkylaluminum oxides and alkoxides; trialkyl gallium compounds; gallium alkoxides; gallium aryloxides; gallium amides; gallium acetylacetonate; gallium t-butylacetylacetonate; alkylgallium alkoxides; trialkyl indium compounds; indium alkoxides; indium aryloxides; indium acetylacetonate; indium t-butylacetylacetonate; stannous phosphate; stannous pyrophosphate; stannous alkoxides; stannous aryloxides; stannous acetylacetonate; and stannous t-butylacetylacetonate. a polymerization stage that includes polymerizing carbon dioxide and at least one alkylene oxide, with a starter, in the presence of a double metal cyanide polymerization catalyst and a catalyst promoter that is devoid of halide anions and cyanide, the catalyst promoter being separate from the double metal cyanide polymerization catalyst; wherein the catalyst promoter is selected from the group consisting of: magnesium alkyls; magnesium alkoxides; magnesium aryloxides; magnesium amides; magnesium acetylacetonate; magnesium t-butylacetylacetonate; scandium alkoxides; scandium aryloxides; scandium acetylacetonate; scandium t-butylacetylacetonate; yttrium alkoxides; yttrium aryloxides; yttrium amides; yttrium acetylacetonate; yttrium t-butylacetylacetonate; hafnium alkyls; hafnium alkoxides; hafnium aryloxides; hafnium amides; hafnium acetylacetonate; hafnium t-butylacetylacetonate; titanium alkyls; titanium aryloxides; titanium amides; titanium acetylacetonate; titanium t-butylacetylacetonate; zirconium alkyls; zirconium alkoxides; zirconium aryloxides; zirconium amides; zirconium acetylacetonate; zirconium t-butylacetylacetonate; vanadium alkoxides; vanadium oxo tris(alkoxides); vanadium aryloxides; vanadium tris(acetylacetonate); vanadium tris(t-butylacetylacetonate); vanadium oxo bis(acetylacetonate); zinc alkyls; alkyl zinc alkoxides; zinc alkoxides; zinc aryloxides; zinc amides; zinc acetylacetonate; zinc t-butylacetylacetonate; trialkyl aluminum compounds; aluminum alkoxides; aluminum aryloxides; aluminum amides; aluminum acetylacetonate; aluminum t-butylacetylacetonate; alkylaluminum oxides and alkoxides; trialkyl gallium compounds; gallium alkoxides; gallium aryloxides; gallium amides; gallium acetylacetonate; gallium t-butylacetylacetonate; alkylgallium alkoxides; trialkyl indium compounds; indium alkoxides; indium aryloxides; indium acetylacetonate; indium t-butylacetylacetonate; stannous phosphate; stannous pyrophosphate; stannous alkoxides; stannous aryloxides; stannous acetylacetonate; and stannous t-butylacetylacetonate.