claim: His [ Dr Spencer's ] latest research demonstrates that – in the short term, at any rate –  the temperature feedbacks that the IPCC imagines will greatly amplify  any initial warming caused by CO2 are net-negative, attenuating the  warming they are supposed to enhance.
evidence: Water vapor feedback is strongly positive, with most evidence supporting a magnitude of 1.5 to 2.0 W / m2 / K, sufficient to roughly double the warming that would otherwise occur.