The forests in Sardasht area in the West Azarbaijan Province were quantitatively studied in this research. Based on Importance Value Index, in general, two types of forests have been identified: Quercus libani Oliv. in the northern, northeastern and northwestern aspects and Quercus brantii Lindl. in the southern, southeastern and southwestern and eastern aspects. The mean of vegetation crown pe...

This paper shows that the asymmetric information present in the relationship between the government and agricultural producers has led to persistent problems in the application of land taxes (Imposto Territorial Rural – ITR) in Brazil. The main result is that, when the asymmetric information is taken into account, some use of output taxes in the optimal tax scheme may be more desirable than a p...

In the Mediterranean region, some wild edible species such as Asparagus acutifolius L. are still harvested and even marketed. Considering the great interest of this species, including its recreational, commercial and agronomic uses, we aimed to study its natural supply and its current scale of harvesting. Nearly 50 plants were monitored in two sites of Central Spain. An experimental harvest of ...

Based on field data from 10 USA cities and national urban tree cover data, it is estimated that urban trees in the coterminous USA currently store 700 million tonnes of carbon ($14,300 million value) with a gross carbon sequestration rate of 22.8 million tC/yr ($460 million/year). Carbon storage within cities ranges from 1.2 million tC in New York, NY, to 19,300 tC in Jersey City, NJ. Regions w...

Mangroves are disappearing rapidly worldwide despite their well documented biodiversity and the ecosystem services they provide. Failure to link ecological processes and their societal benefits has favored highly destructive aquaculture and tourism developments that threaten mangroves and result in costly "externalities." Specifically, the potentially irreparable damage to fisheries because of ...

Global population is expected to reach 9 billion by 2050, increasing pressure on food production (Godfray et al., 2010). Constraintson crop production areparticularly acute in Africa where population growth is greatest and where 80% of all food is produced by small holder farmers on farm sizes of less than one hectare (Stevenson and Belmain, 2016). Crop losses caused by pests and diseases are t...

We analyse the impacts of a change in consumers’ preference forNovel Protein Foods (NPFs), i.e. a lifestyle change with respect to meat consumption, and the impacts of environmental policies e.g. tradable emission permits for greenhouse gases (GHGs) or an EU ammonia (NH3) emission bound per hectare. For our analysis we use a global applied general equilibrium (AGE) model that includes consumers...

The world population is projected to increase by nearly 30 percent and reach 9.0 billion by 2050. Increasing competition for global protein is anticipated due to this burgeoning population and from the rising demand for food and protein that is a consequence of economic development and higher income in emerging economies, most notably India and China. It has been estimated that the world’s farm...

Shade-grown coffee is an agricultural system that contains some forest-like characteristics. However, structure and diversity are poorly known in shade coffee systems. In 61 coffee-growers' plots of Chiapas, Mexico, structural variables of shade vegetation and coffee yields were measured, recording species and their use. Coffee stands had five vegetation strata. Seventy seven woody species most...

Effects of breed and sward surface height on ewe liveweight and body condition changes and on lamb liveweight gains during grazing in the spring and autumn were studied. The output per hectare in each season was also calculated. A total of 112 Gallega ewes (35Æ6 kg live weight) and 204 Latxa ewes (47Æ5 kg live weight) with their lambs were used during the spring (March–June) to study the effect...