Absolute rubbish. Large areas of agricultural land within the EU alone (including Ireland) are being used at zero- or near-zero production capacity because the EU subsidy regimes are based on the current necessity to avoid over-production of milk, beef, lamb etc. On a different level altogether, it hardly credible to argue that land in places like Zimbabwe is utilised at full production capacity.
People have been saying at least for the past 100+ years that the age of technological advance is at an end. Who was they guy who said around 1900 that, based on the then-current trends, and projecting for expected population growth, New York would be buried under six feet of horse manure by the year 2000 (or whenever)? Who was it who said sometime during the 20th century that there might sometime be a global market demand for five computers?