Sustainable development can be used as a tool against environmental vulnerability. Environmental vulnerability can be identified by applying risk analysis and assessment to define hazards to persons and the environment, determine the probability of occurrence of these hazards, the possible magnitude of events, consequence analysis, and quantitative analysis of system failure probability). Identifying risk limits entails defining the acceptability of the risk, (which can be classified as acceptable or in need of reduction), and to reduce risk by designing and implementing risk-reduction measures and controls. Risk is a probability of an adverse combination of the probability of occurrence of an event, and the possible extent of that event's adverse effects and consequences on ecosystems and persons. There are important links between the environment, vulnerability and threats. Such risks include terrorist acts against the environment and human beings using resources as tools and/or targets.