By increased rural-urban migration in many African countries, the assessment of changes in catchment hydrologic responses due to urbanization is critical for water resource planning and management. This paper assesses hydrological impacts of urbanization on two medium-sized Zimbabwean catchments (Mukuvisi and Marimba) for which changes in land cover by urbanization were determined through Landsat Thematic Mapper (TM) images for the years 1986, 1994 and 2008. Impact assessments were done through hydrological modeling by a topographically driven rainfall-runoff model (TOPMODEL).

Making sure that we will continue to have enough to eat is at the heart of our shared ambitions to mitigate climate change. The United Nations Framework Convention on Climate Change (UNFCCC), the convention that has guided us through the highs and lows of 18 rounds of annual negotiations, states upfront that the reasons to stabilise emissions are threefold: to allow ecosystems to adapt naturally , to enable economic development to proceed in a sustainable manner and to ensure that food production is not threatened .

Making sure that we will continue to have enough to eat is at the heart of our shared ambitions to mitigate climate change. The United Nations Framework Convention on Climate Change (UNFCCC), the convention that has guided us through the highs and lows of 18 rounds of annual negotiations, states upfront that the reasons to stabilise emissions are threefold: to allow ecosystems to adapt naturally , to enable economic development to proceed in a sustainable manner and to ensure that food production is not threatened .

The impact of human endeavours on the environment in the struggle to eke out a living through crop and animal agriculture is examined in a holistic context. Analyses focus on all the sources of pressure that modify the vegetation cover of rural Africa, including the effects of fires and burning of biomass, fuel wood extraction and deforestation and land clearing.

As the problems of impact assessement are rather intractable, a fairly simple dual approach is proposed. First the major components of environmental impact of current agricultural production systems in Africa (i.e. impact of cropping, livestock keeping, fuelwood and timber extraction and burning) are summarised. Second, "danger zones" in which current and future environmental impacts will be most severe and on which ILCA has focused its problem solving-research is identified.

REDD initiatives are more likely to succeed if they build on the interests of forest communities and indigenous people. More attention is needed to the balance of incentives, benefits, rights and political participation across levels of decision making, interest groups and administration. Incentives can include payments or other benefits for good practices, developing alternative livelihoods, formalising land tenure and local resource rights and intensifying productivity on nonforest lands.

This introductory chapter sets the scene for the discussion in the edited volume on how new agricultural affects tropical forests. It critically reviews four hypotheses that have been central in the claim that better technologies help protect forests: the Borlaug, the subsistence, the economic development and the land degradation-deforestation hypotheses. Each of them appears to be valid only under certain restrictive conditions. The chapter then gives the aims and scope of the book, the key conclusions, as well as a summary of each of the chapters.

Previous international and national policies have, for various reasons, failed to prevent deforestation in developing countries. REDD+ incorporates some of these past policies, but also some innovations. Lessons from past experience will need to be taken on board and new alliances will need to be forged if REDD+ is to be successful.

Fires are considered a potential threat to sustainable development for their direct impacts on ecosystems, their contribution to carbon emissions, and impacts on biodiversity. In 1997/98, Indonesia had the most severe fires worldwide, and smoke haze pollution recurs yearly. The fire-related policy problems are defined as smoke haze pollution, forest degradation and deforestation, and impacts on the rural sector. Some of the apparent major causes of the problems are identified. The estimate of area affected by fires in 1997/98 is revised from 9.7 million hectares to 11.7 million hectares.