Calculating farming’s contribution to greenhouse gas emissions is difficult, but experts agree that feeding the world’s people has tremendous climate and environmental impacts.
Nature needs time to adjust and adapt to biosphere changes. After life appeared on Earth, atmospheric oxygen gradually went from zero to 20 per cent, oceans appeared and disappeared, mountains thrust upward and then eroded, continents moved on tectonic plates, climate cycled between ice ages and warm intervals, magnetic poles reversed and re-reversed. Life flourished because species and ecosystems evolved over time.
The GDP measures the value of all transactions for goods and services. But many agree that its biggest flaw is that it say little about 'the welfare of a nation.