Welcome to the online climate exercise. This exercise is administered by the System Dynamics group at MIT's Sloan School of Management.
The applets used in this exercise require version 5.0 or greater of the Java runtime. If you are unable to see an applet (there is only a red X on a grey background), try updating your Java runtime. The version 5.0 Java runtime can be obtained here: http://java.sun.com/j2se/1.5.0/download.jsp. Make sure to download the JRE -- the JDK is not needed.