Scope and limits

This is a scoped absence, not a universal one. It establishes what this document does not contain, using the named search terms over the named page ranges. It does not establish that ESA holds no such assessment elsewhere. The companion technical notes TN 01, TN 02, TN 03 and TN 05 (SRC-204, SRC-205, SRC-206, SRC-208) were searched in their text layers for the same terms: none gives a life-cycle assessment or a carbon intensity per kWh or MWh, and none mentions ozone or the stratosphere; TN 03 p.23, the source of this document's launch derivation, lists carbon soot among the exhaust products of solid boosters and kerosene engines, and alumina among those of solid boosters, without assessing them. The document does print the inputs for an intensity: a total of 2.6 million tons of CO2 from the launches to deploy one SPS Alpha (p.73), an annual output of c.15.7 TWh for one 2 GW system (p.75), and a 30-year economic life used in its comparison (p.73). Our arithmetic from these, 2.6E+12 g over 15.7 TWh x 30 years (4.71E+11 kWh), gives about 5.5 gCO2e/kWh for launch emissions of the space segment only, excluding manufacture and the ground segment. The document does not print this figure, and it must not be attributed to the document. The document also gives 15.8 TWh a year, allowing for equinox and maintenance downtime (p.43), and c.17 TWh (p.70, p.72); on 17 TWh the same arithmetic gives about 5.1 gCO2e/kWh, which the document does not print either.