Climate scenarios constructed from equilibrium GCM experiments alone (e.g., Howe and Henderson - Sellers, 1997; Smith and Pitts, 1997) do not consider this uncertainty, but some assumption about the driving emissions scenario is required if climate scenarios are to describe the climate at one or more specified times in the future. (ipcc.ch)
For example, the RBA can enter into a swap to buy foreign exchange from banks for Australian dollars, with an agreement to sell the foreign exchange back, at an agreed exchange rate, at a specified time in the future. (rba.gov.au)
They are a promise to repay the amount borrowed at a specified time in the future. (soundmindinvesting.com)