Theodore Judah dreamed of building a railroad in the US that connected the west to the east - a transcontinental railroad.
Hitler because he's a loser who tried to create a Aryan super race in World War II that he was nothing like. To be considered to be in this "super race" in the super you had to be tall, athletic, blue eyed and blond. Hitler was short, fat and had black hair. I dont know what color his eyes were byut I'm pretty sure they weren't blue! Also he was against Jews, even though his mother was one... But because of Hitler we have Assault Rifles, Main Battle tanks and Jets. If he did not take Germany and prove technically superior to the Allies we wouldn't have M1A1 Abraham's or the M-16 or the AK-47. In fact, Kalashnikov based the AK-47 off of the STG-44. ^ This is why he's infamous. These are the items that make the world a violent place.
The echo system concerns the ecological system that allows plants and animals, and humans to find food, and to allow it to replenish itself. That is a broad description, and it is broad, subject to correction. The roots of the problem began to a large degree when industrialization began to interfere with all kinds of life affected by factories and the pollution factories produce. Certainly there is a historical theme to this process, beginning for the most part by the industrial revolution. Currently this has caught the attention of almost everyone. Ways to prevent industrialization from making a negative impact on this began in earnest several decades ago.