Less Bang for the Buck?

The suggestion by the NFU that farming has to consider radical ideas if it is not to be seen as a major impediment to the control of global warming is certainly true (https://www.theguardian.com/environment/2018/oct/12/low-emission-cows-farming-responds-to-climate-warning). The hope, however, that 'low emission' cows can safely replace the current crop doesn't really cut it as they (even if they existed) would still occupy the same land mass and consume the same amount of water. The same would apply to 'low emission' pigs and sheep.