Claim: a new study by a leading climate economist, Richard Tol of the University of Sussex, concludes that warming may well bring gains, because carbon dioxide causes crops and wild ecosystems to grow greener and more drought-resistant.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: It may improve productivity by warming the soil, incorporating fertilizer and controlling weeds, but also renders soil more prone to erosion, triggers the decomposition of organic matter releasing CO2, and reduces the abundance and diversity of soil organisms.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: While CO 2 is expected to be good for crop productivity at lower temperatures, it does reduce the nutritional values of crops, with for instance wheat having less protein and some minerals.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: If GHG emissions grow a lot (IPCC scenario RCP8.5), already dry regions may have more droughts and less soil moisture.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: It is the first comprehensive contribution to the global warming debate by an economist and its conclusions lead to the promise of urgent action by the UK government to further curb Europe's CO 2 emissions and engage other countries to do so.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: In 2009, Tol published an influential paper that combined data from several earlier studies, concluding that at least some amount of global warming could lead to economic gains.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: The CO2 fertiliser effect has been greatly overestimated during Free-Air Carbon dioxide Enrichment (FACE) experiments where results show increased CO2 levels in the atmosphere enhances photosynthesis, reduce transpiration, and increase water use efficiency (WUE).

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Climate change can have an effect on the [[carbon cycle]] in an interactive "feedback" process .

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Elevated atmospheric carbon dioxide affects plants in a variety of ways.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Unanimous agreement was found among the models that future climate change will reduce the efficiency of the land and ocean carbon cycle to absorb human-induced CO. As a result, a larger fraction of human-induced CO will stay airborne if climate change controls the carbon cycle.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Some research suggests that initially climate change will help developing nations because some regions will be experiencing more negative climate change effects which will result in increased demand for food leading to higher prices and increased wages.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Plants require carbon dioxide to conduct photosynthesis.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Elevated CO2 increases crop yields and growth through an increase in photosynthetic rate, and it also decreases water loss as a result of stomatal closing.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Climate change is attributed to land use for two main reasons.