These and other storms underscore a long-term severe weather trend that promises to get worse. To understand the potential economic consequences of such increases based on the number and severity of the region’s storms, one need only focus on the Asian Development Bank’s estimate that the cost of natural disasters within Asia has outpaced its gross domestic product growth during the last four decades.
Additional impacts of climate change are also likely on the way. For example, global warming will result in the expansion of the water column, especially in the tropics, leading to increased coastal inundation and saltwater intrusion into agricultural areas and freshwater aquifers.
Asean’s great coastal cities and communities are also at risk. More than half of Southeast Asia’s population lives in coastal areas. The fact that the region has very low rates of insurance makes Asean’s exposure to climate change even worse. For example, it has been estimated that of the $45.7 billion in losses caused by the 2011 floods in Thailand, only $12 billion was covered by insurance and most of that was for business interruptions. Similarly, of the $14 billion in losses associated with Typhoon Haiyan, only between $1 billion and $2 billion was insured. This is hardly a surprise. Insurance rates in Asia are only 7.6 percent, compared to 67 percent in the United States. Stating the obvious, when people don't have insurance their governments either pick up the check or, as is more often the case, they go without and struggle to recover from the disasters that have befallen them.
Science-based partnerships and understanding can help address these climate change challenges. There are a wide variety of science and technology tools and best practices to inform Asean’s leaders how best to strengthen urban and community resilience to these expected changes. For example, with regard to flooding and water management, which are critical challenges, tools include geospatial maps to visualize risks to natural and other assets. These maps can be integrated with many other types of data, including where people live and their demographics. Models can project the amount of sea level rise and inundation, helping to plan for growing communities and prepare for and respond to natural disasters. There are also planning tools that can assist in designing and implementing green infrastructure strategies, such as well-designed landscapes to reduce stormwater runoff and flooding. Green infrastructure solutions can contribute to improved flood protection, energy savings, air quality, property values and healthier communities.
For communities that want to consider human health impacts of water management projects and plans, a health impact assessment tool can be used to maximize health benefits and minimize adverse health impacts that might otherwise not be considered. Fortunately, some Asean member countries are starting to develop health impact assessments to inform policy-making and even integrating them as part of environmental assessment processes.