**1. Introduction**

*Eucalyptus* species, the most widely planted hardwoods in the world [1], have considerable potential for sequestering carbon. For *E. urophylla* in Brazil and *E. globulus* in Spain, rotation length, number of coppice rotations, site quality, carbon credit, and discount rate influenced carbon sequestration value [2]. *E. urophylla* × *E. grandis* hybrids in subtropical China maximize sequestration in 12–15 year rotations [3]. In Pakistan, *E. camaldulensis* is one of the best sequestration options for marginal areas [4], and in northwest India, *E. tereticornis* used in agroforestry is a viable option for

carbon mitigation [5]. In Portugal, sequestration by *E. globulus* plantations was smaller than that of their derived wood products [6].

In subtropical central and southern Florida, USA, (annual rainfall of ~1400 mm mainly during the summer, average maximum temperature of ~28°C, average minimum temperature of 18°C, and lowest temperature of −2°C), eucalypts have numerous potential applications. We previously described their potential for maximizing SRWC productivity through genetic improvement and site amendments, such as BC [7]. On former citrus and phosphate mined lands, *E. grandis* cultivars may have maximum mean annual increments (MAImax) up to 78.2 green Mg/ha/year with an internal rate of returns (IRR) over 10% when grown as SRWCs [8].

BC improves many soil properties and thereby increases productivity [9–11], especially in sandy soils common to central and southern Florida [12, 13]. BC's numerous applications, including carbon sequestration [14], have considerable market potential.

Here, we expand our previous estimations of carbon sequestration by eucalypts with and without BC in Florida [15] by estimating (1) the economic potential for carbon sequestration by Eucalyptus planted in long-term mulch wood plantations, in more WBs, and in dendroremediation applications and (2) the responses to BC as a soil amendment with and without compost in additional field studies in Florida.
