Addressing climate change problems requires a decision-making timeframe that most people and organizations are not familiar with - decades and centuries, as opposed to next quarter or next year.  Combine this long-term approach with even a modicum of uncertainty and decision-makers will have great difficulty in engaging the public or organizations who are largely focused on the shorter-term.  Consequently, effective communication will require the following decision support tools:

Scenario development based on a range of impacts (e.g., "if sea level rises 1m, this happens; if it rises 1.5m, that happens") so that uncertainty is addressed in a way that allows decisions to be made based on a rational assumption of risk over time

Stakeholder engagement that crosses disciplines in a fashion that allows effective communication between persons with differing levels and categories of knowledge 

Record-keeping of decisions that captures the basis for the decision at the interval in time at which the decision was made (e.g., the Canadian provinces that built the Confederation Bridge designed it to handle a 1m rise in sea level when it was constructed in the 1990s; they might use a different design standard today, but the "wisdom of the context" has to be reflected in the record)

The National Climate Service can be of benefit to decision-makers in this area by helping develop and promote such decision support tools and by providing climate data in a framework that fits in this long-range, scenario-based approach in a way that is accessible to stakeholders comprising multiple disciplines.