La Nina:

La Nina and El Nino are weather patterns that impact specific areas of the world. El Nino years produce warmer than average water in the Pacific Ocean while La Nina produce cooler than average surface temperatures. La Nina and El Nino have several effects on global weather patterns but they are primarily caused by changes in trade winds and West African monsoons.

During El Nino years, the West African monsoon (which is where Atlantic storms/hurricanes are created) are torn apart by stronger than normal trade winds before they reach North America. In La Nina years, the trade winds are weaker, so the storms/hurricanes grow larger and more destructive.  A rule of thumb when assessing the impacts of La Nina is that La Nina is characterized by a "stronger" normal, for example:
Areas with good rain falls could flood
Areas that are drier could have drought

Examples of "Stronger Normals":
More hurricanes in the Atlantic
Drought in Brazil

Heavy rain in Indonesia and India

Materials/Building Blocks Impacts:

Via Flooding:

Australian coal operations

Palm-oil output in Malaysia

Via Cold Weather:

North American Natural Gas
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Down Stream Materials Consuming XXX:

Raw Materials: