Carbon Dioxide as “food for plants”
The coal industry in the United States has repeatedly tried to make such claims, but the short-term stimulation of plant productivity and crop yields at elevated CO2 diminishes with longer exposures (weeks, months, years), a phenomenon known as CO2 acclimation. Moreover, longer exposures to elevated CO2 decrease food quality and increase pest problems because pests must consume more plant product to meet their nutritional needs. I have discovered that elevated CO2 inhibits the conversion of nitrate into protein in most plants.
Social Cost of Carbon
There is almost no disagreement among economists that the full cost to society of burning a ton of carbon is greater than its private cost.
…the models can tell us nothing about the most important driver of the SCC, the possibility of a catastrophic climate outcome.
The ACCCE report questions a number of issues as if they were in dispute or subject to major uncertainties that have been resolved for decades. The report appears to question the relative roles of natural and anthropogenic emissions in driving climate change. It has long been known that anthropogenic emissions are driving the increase in CO2 concentration.
The ACCCE report appears to question whether greenhouse climate change will cause damages. The methods of accounting and costing damages from climate change have been contentious and often questioned. Much of that questioning has been based on a concern that the way damages are represented is too simple, leading to damage assessments that could grossly under-represent the true damages. The uncertainties relate to the scale of the damages, not to the very likelihood of them happening as implied in the report.
Sea Level Rise
If this was a review of the literature written by a student, then it would get a very poor fail - it ignores most of the scientific work that has been done, and instead relies on relatively obscure and carefully selected papers from a small number of authors.
The authors provide no quantitative estimate of what the acceleration "should" be if sea level were actually rising according to "AGW theory." The real test of the models is whether they reproduce observed sea level, and over the past half-century (when we have good observational data), they do appear to. The models in fact show that the present acceleration should be small.