Dependence on imported oil is the largest crisis. The United States alone consumes at least 25 percent of the worlds oil and about 70 percent of that is imported. Oil, coal, and natural gas together supply at least 85 percent of the world energy supply

And what, pray tell, is your question?

To determine the largest crisis, one must understand the level of dependence on imported oil by the United States and its significance in the global energy supply. Here's a breakdown of the explanation:

1. Determine the percentage of the world's oil consumption by the United States: The statement mentions that the United States alone consumes at least 25 percent of the world's oil. You can arrive at this number by considering the total global oil consumption and calculating what percentage of it is consumed by the United States.

2. Calculate the percentage of imported oil consumed by the United States: The statement indicates that around 70 percent of the oil consumed by the United States is imported. This can be determined by considering the total oil consumption in the country and calculating how much of it is supplied from domestic sources versus imports.

3. Assess the significance of oil, coal, and natural gas in the global energy supply: To determine the overall energy supply, you need to consider the combined contribution of oil, coal, and natural gas. The statement mentions that the trio together supplies at least 85 percent of the world's energy. This figure can be calculated by summing up the individual shares of oil, coal, and natural gas in the global energy supply.

By combining these pieces of information, you can ascertain the level of dependence on imported oil by the United States and evaluate its impact on the global energy crisis.