«The presence of ice on the continents and pack ice on the oceans would inhibit both silicate weathering and photosynthesis, which are the two major sinks for CO2 at present.» (newworldencyclopedia.org)
Major sinks, likewise: for example, as continents collided, mountain - ranges were formed, making phenomenal amounts of rock debris available to weathering - agents, of which carbon dioxide dissolved in rainwater is one of the most important. (skepticalscience.com)
«This was clearly not realistic, as the estimated maximum numbers of birds killed typically exceeded breeding density and productivity combined, such that the prey populations studied would probably have gone extinct rapidly at a local level or acted as a major sink for birds immigrating from neighbouring areas.» (voxfelina.com)