The only way to truly test if a variable is undefined is to do the following. Remember, undefined is an object in Javascript. To determine if a variable or object property exists, It is good to compare to keyword undefined or you can also check the type of the object to string âundefinedâ. In the following JavaScript code we compare the num to the undefined in both way.
Nuclear waste -- The waste from nuclear power plants will be toxic for humans for more than 100,000 years. Itâs untenable now to secure and store all of the waste from the plants that exist. To scale up to 2,500 or 3,000, let alone 17,000 plants is unthinkable.
Nuclear energy has no place in a safe, clean, sustainable future. Nuclear energy is both expensive and dangerous. And just because nuclear pollution is invisible doesnât mean itâs clean. Renewable energy is better for the environment, the economy, and doesnât come with the risk of a nuclear meltdown.ew nuclear plants are more expensive and take longer to build than renewable energy sources like wind or solar. If we are to avoid the most damaging impacts of climate change, we need solutions that are fast and affordable. Nuclear power is neither. We can do better than trading off one disaster for another.