wolfyvegan

archived (Wayback Machine)

archived (Wayback Machine)

• Brazil’s President Lula apparently lives in a “disinformation space” surrounded by ministers promoting projects that destroy the Amazon Rainforest and lock in petroleum extraction for decades to come, a new opinion piece argues.
• Among these projects are the BR-319 highway and its associated side roads; the distribution of government land to known deforesters; and opening new oilfields at the mouth of the Amazon River.
• Lula’s support for these proposals is leading Brazil to a climate catastrophe that would devastate the country, the author writes, and the two key ministers who should be the ones to explain to the president the consequences of these projects are apparently not penetrating Lula’s disinformation space.
• This post is a commentary. The views expressed are those of the author, not necessarily of Mongabay.

archived (Wayback Machine)

• Brazil’s President Lula apparently lives in a “disinformation space” surrounded by ministers promoting projects that destroy the Amazon Rainforest and lock in petroleum extraction for decades to come, a new opinion piece argues.
• Among these projects are the BR-319 highway and its associated side roads; the distribution of government land to known deforesters; and opening new oilfields at the mouth of the Amazon River.
• Lula’s support for these proposals is leading Brazil to a climate catastrophe that would devastate the country, the author writes, and the two key ministers who should be the ones to explain to the president the consequences of these projects are apparently not penetrating Lula’s disinformation space.
• This post is a commentary. The views expressed are those of the author, not necessarily of Mongabay.

archived (Wayback Machine)

• Brazil’s President Lula apparently lives in a “disinformation space” surrounded by ministers promoting projects that destroy the Amazon Rainforest and lock in petroleum extraction for decades to come, a new opinion piece argues.
• Among these projects are the BR-319 highway and its associated side roads; the distribution of government land to known deforesters; and opening new oilfields at the mouth of the Amazon River.
• Lula’s support for these proposals is leading Brazil to a climate catastrophe that would devastate the country, the author writes, and the two key ministers who should be the ones to explain to the president the consequences of these projects are apparently not penetrating Lula’s disinformation space.
• This post is a commentary. The views expressed are those of the author, not necessarily of Mongabay.

archived (Wayback Machine)

Those in the USA can call their senators about it.

Those in the USA can call their senators about it.

Significance

The productivity of staple crops is a key factor shaping the affordability of food and the amount of land and other resources used in agriculture. We synthesize evidence on how the weather faced by these crops has changed and how these changes have affected productivity. Most cropping regions have experienced both rapid warming and atmospheric drying, with significant negative global yield impacts for three of the five crops. Models can largely reproduce these changes and impacts with two important exceptions—they overstate warming and drying in North America and understate drying in most other temperate regions. These insights can help to guide adaptation efforts and model improvements.

Abstract

Efforts to anticipate and adapt to future climate can benefit from historical experiences. We examine agroclimatic conditions over the past 50 y for five major crops around the world. Most regions experienced rapid warming relative to interannual variability, with 45% of summer and 32% of winter crop area warming by more than two SD (σ). Vapor pressure deficit (VPD), a key driver of plant water stress, also increased in most temperate regions but not in the tropics. Precipitation trends, while important in some locations, were generally below 1σ. Historical climate model simulations show that observed changes in crops’ climate would have been well predicted by models run with historical forcings, with two main surprises: i) models substantially overestimate the amount of warming and drying experienced by summer crops in North America, and ii) models underestimate the increase in VPD in most temperate cropping regions. Linking agroclimatic data to crop productivity, we estimate that climate trends have caused current global yields of wheat, maize, and barley to be 10, 4, and 13% lower than they would have otherwise been. These losses likely exceeded the benefits of CO2 increases over the same period, whereas CO2 benefits likely exceeded climate-related losses for soybean and rice. Aggregate global yield losses are very similar to what models would have predicted, with the two biases above largely offsetting each other. Climate model biases in reproducing VPD trends may partially explain the ineffectiveness of some adaptations predicted by modeling studies, such as farmer shifts to longer maturing varieties.

archived (Wayback Machine)

Significance

The productivity of staple crops is a key factor shaping the affordability of food and the amount of land and other resources used in agriculture. We synthesize evidence on how the weather faced by these crops has changed and how these changes have affected productivity. Most cropping regions have experienced both rapid warming and atmospheric drying, with significant negative global yield impacts for three of the five crops. Models can largely reproduce these changes and impacts with two important exceptions—they overstate warming and drying in North America and understate drying in most other temperate regions. These insights can help to guide adaptation efforts and model improvements.

Abstract

Efforts to anticipate and adapt to future climate can benefit from historical experiences. We examine agroclimatic conditions over the past 50 y for five major crops around the world. Most regions experienced rapid warming relative to interannual variability, with 45% of summer and 32% of winter crop area warming by more than two SD (σ). Vapor pressure deficit (VPD), a key driver of plant water stress, also increased in most temperate regions but not in the tropics. Precipitation trends, while important in some locations, were generally below 1σ. Historical climate model simulations show that observed changes in crops’ climate would have been well predicted by models run with historical forcings, with two main surprises: i) models substantially overestimate the amount of warming and drying experienced by summer crops in North America, and ii) models underestimate the increase in VPD in most temperate cropping regions. Linking agroclimatic data to crop productivity, we estimate that climate trends have caused current global yields of wheat, maize, and barley to be 10, 4, and 13% lower than they would have otherwise been. These losses likely exceeded the benefits of CO2 increases over the same period, whereas CO2 benefits likely exceeded climate-related losses for soybean and rice. Aggregate global yield losses are very similar to what models would have predicted, with the two biases above largely offsetting each other. Climate model biases in reproducing VPD trends may partially explain the ineffectiveness of some adaptations predicted by modeling studies, such as farmer shifts to longer maturing varieties.

archived (Wayback Machine)

archived (Wayback Machine)