what are the physical properties of the first mentioned gas?
At low concentrations the gas is odorless; however, at sufficiently-high concentrations, it has a sharp, acidic odor.
Carbon dioxide
At low concentrations the gas is odorless; however, at sufficiently-high concentrations, it has a sharp, acidic odor. 
what is greenhouse gas emissions by turkey? It account for about one percent of the world's total and include carbon dioxide, methane, and hydrofluorocarbons..
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Carbon dioxide [SEP] Physical properties
Carbon dioxide is colorless. At low concentrations the gas is odorless; however, at sufficiently-high concentrations, it has a sharp, acidic odor. At standard temperature and pressure, the density of carbon dioxide is around 1.98 kg/m, about 1.67 times that of air. Carbon dioxide has no liquid state at pressures below . At 1 atmosphere (near mean sea level pressure), the gas deposits directly to a solid at temperatures below and the solid sublimes directly to a gas above −78.5 °C. In its solid state, carbon dioxide is commonly called dry ice. Liquid carbon dioxide forms only at pressures above 5.1 atm; the triple point of carbon dioxide is about 5.1 bar (517 kPa) at 217 K (see phase diagram).