gas emissions would be instituted and emission credits would be sold to, and then traded among, emitters. Part of the revenue from the sold credits would go to investments in renewable energy, though it's not clear what would happen to the rest. A so-called 'Gang of 15', comprising senators from states that depend on coal-fired power plants for energy, is especially opposed to Obama's system be...

This paper is concerned with the approach followed in Western Australian for dealing with the environmental hazards of ionising radiation associated with the mining and processing of titaniferous minerals contained in mineral sands deposits. There is a growing public awareness of the risks posed by one of these minerals, monazite, which emits low levels of radiation as it contains thorium and u...

Sorption of P to the bed sand medium is a major removal mechanism for P in subsurface flow constructed reed beds. Selecting a sand medium with a high P-sorption capacity is therefore important to obtain a sustained P-removal. The objective of this study was to evaluate the P-removal capacities of 13 Danish sands and to relate the removal to their physico-chemical characteristics. The P-removal ...

Ginsburg and Sands defined a procedure for completely disconnecting graphs: each round, remove at most one edge from each component and at most w edges total. Define fw(g) to be the minimal number of rounds to reduce G to isolated vertices. Prior work of Ginsburg and Sands has determined fw(Pn) for 2 ≤ w ≤ ∞ and the lead-term asymptotics of f∞(Kn) and f2(Kn)). We show that when T is a tree with...

Parajulee and Wania (1) make an important contribution to understanding the origin and magnitude of pollution caused by the massive oil sands industry in northeastern Alberta. Until recently, the oil sands industry and government officials have claimed that all pollutants carried by the lower Athabasca River system were the result of soil erosion, forest fires, and other natural phenomena. This...

Extraction of oil from Canadian tar sands is becoming increasingly contentious as it is claimed the process is one of the highest in terms of greenhouse gas emissions. But now, along with environmental campaigners, some shareholders in the companies that mine and fund tar sand oil are beginning to protest at the activity. British companies spearheading the drive to exploit the Canadian tar sand...